The Magical Principles of Natural Philosophy at Hogwarts

Erwin was startled by Hermione's sudden burst of enthusiasm.

This little girl didn't have many friends in school before, but now she suddenly discovered that Erwin and she had a similar one-of-a-kind magical talent. It was like an endangered animal suddenly discovering its own kind, and her excitement was palpable.

She had a lot to talk about, and from the next morning it was as if there were dozens of birds chirping in Erwin's ears, and Hermione didn't quiet down until they got into the back seat of Mr. Granger's car.

"Will there be an entrance exam when we enter that magic school? I got six perfect marks when I graduated from elementary school, but I'm not sure I can maintain my excellence in magic studies." Hermione looked very distressed, "

If there is really an exam, it will be troublesome. We can only buy textbooks today and only have less than twenty days to prepare for preparation..."

"Don't worry too much, dear," Mrs. Granger stroked her daughter's thick curly hair, "it's impossible for them to test you on something you don't already know."

"This is not necessarily the case, Erwin, we have to work hard..."

Erwin turned his head expressionlessly, "Miss Granger, I have a few questions. First of all, do you know the difference between definite integrals and indefinite integrals?"

Hermione was stunned.

"Can't you answer it? Then let me change the question, how are neutrinos produced?"

"..."

"Still don't know?" Erwin sighed helplessly, "The last question," he looked over with hope, "can you tell who first proposed the thermodynamic concept of entropy?"

There was still an embarrassing silence, Hermione bit her lip, her passion was dampened by the three basins of cold water.

"Okay," Erwin shrugged, "These are relatively basic questions. I thought there would be someone who could really discuss the issues with me, but it seems that I thought too much."

Miss Nutria was completely quiet now.

Erwin turned his head and tried to suppress the twisted smile on his lips, but Mr. Granger had already started laughing, and then Mrs. Granger tapped her head reproachfully.

"Concentrate on driving."

Professor Stewart also looked a little helpless, "Where are we going?" he asked his son-in-law.

"Da Xingang Street, I marked it on the map, um, yes, that's where it is."

An hour later, they arrived at the marked spot.

"Professor McGonagall gave me a badge and said that if I hold it in my hand, I can see the Leaky Cauldron." Mr. Granger glanced around, "It should be right there."

He pointed to the only narrow facade on the street without a signboard. It was incompatible with the surrounding environment, but no passers-by noticed it.

"Muggle shielding charm." Erwin whispered.

Mr. Granger carefully opened the door, and a turbid smell came out, making Erwin frown.

Dark and dirty, this was Erwin's first impression of this bar. It seemed that the wizards were not very particular about environmental hygiene.

Although it was morning, the bar was almost full. Most of the customers were elderly people, and their clothes were more contemporary than their own. Erwin and his group looked very out of place.

Just when Mr. Granger was at a loss, a witch sitting near the door stood up. She looked to be sixty or seventy years old, wearing a neat and thick dark green robe, and a pointed hat of the same color.

.

Erwin immediately realized who she was. She was the only one in the bar who looked like a professor.

"Good morning, Mr. Granger," the witch glanced at Hermione and landed on Erwin and Professor Stewart, "I should have told you before that there is a limit to the number of places you can enter Diagon Alley."

"This child happened to have received the admission notice, so I brought him here." Mr. Granger said quickly, and Erwin took out his letter and handed it over.

Professor McGonagall did not open the envelope, but took out her wand and tapped it gently. The Hogwarts on the envelope glowed slightly red.

It's a pretty good way of verifying counterfeiting.

"There is no problem with the temporary admission notice." Professor McGonagall nodded slightly, "Professor Flitwick should have been the one to guide you, but there is no need to trouble him now. Welcome to Hogwarts, El.

Vin Frost.”

She turned around and said, "I will take you to Diagon Alley now, where you can buy everything on the list."

Erwin can roughly draw a conclusion from Professor McGonagall's words. Guiding Muggle children to prepare for school seems to be one of the main tasks of the Hogwarts staff. After all, there are less than twenty Muggle students every year.

, the workload will not be very large if it is divided among several professors.

After saying hello to the gloomy-looking bar owner, Mag led them through the bar to the backyard, and pointed at the masonry wall with the wand.

As the Grangers exclaimed, the masonry that formed the wall began to rotate, forming an arched passage in a few seconds.

Passing through the passage, they came to Diagon Alley.

The door of the shop nearest to them faced stacks of cauldrons, and on the right was a large display window displaying several brooms.

"I'll take you to Gringotts first, where you can exchange wizard coins. The merchants on this street don't accept pounds."

They walked through Diagon Alley, and Hermione kept looking around excitedly. She had recovered from the shock and asked Professor McGonagall many questions, while Erwin remained quiet and observed silently.

This alley is at most two hundred meters long, and there are no more than twenty merchants including roadside stalls, and there is basically only one store of each type.

This can only be said to be a small market.

"Professor McGonagall," Erwin said, "How many places like Diagon Alley are there in London?"

The witch glanced at him in surprise, "This is the only place where Diagon Alley is the most important trading place for wizards in the UK."

Can such a place meet most of the trading needs? Erwin thought thoughtfully, which may mean that the overall wizarding population in the UK is less than five figures.

Gringotts is a huge white stone building at the end of Diagon Alley. After entering the brass door, Erwin discovered that it was actually an old-fashioned bank, but all the clerks were short,

A humanoid creature with an exaggerated nose and ears.

"These are...goblins?" Erwin took a deep breath and realized that he had just made a mistake when estimating the number of wizards in the UK. Not all wizards in the population were "human".

"They are goblins." Professor McGonagall corrected: "A creature with advanced intelligence and possessing magical abilities no less than those of human wizards. Goblins are just similar in appearance to goblins, but they are much stupider."

"Then why don't we go to a bank opened by human wizards?" Hermione asked casually.

"Because Gringotts is the only bank approved by the Ministry of Magic, little girl." The answer was not Professor McGonagall, but a goblin who walked over, with a cunning light shining in his eyes.

"Uh, I'm sorry...I'm not..." Hermione's face turned red and she was a little incoherent. The little girl thought she had offended the other person.

The goblin turned around and greeted Professor McGonagall, "What can I do for you, ma'am?"

"Exchange these two boys for some galleons."

"Then please come with me."

The goblin led them to a counter in a corner and then went to greet other customers, "This is clerk Gasly No. 47," the goblin on the counter spoke at an alarming speed, "The ratio of pounds to galleons is five.

For comparison, we also provide transfer services if necessary.”

"After buying everything on the list and counting the possible expenses for school this year, one hundred and fifty galleons will be more than enough." Professor McGonagall reminded.

The Grangers thought about it and exchanged three hundred galleons. They were both dentists and had their own clinic, so they were quite financially wealthy. Hermione was their only daughter, so naturally they were not stingy.

After the goblin finished counting, he gave them a bulging bag of gold coins.

It was Erwin's turn, "Is there an upper limit for this exchange?" he asked directly.

The goblin clerk glanced at him in surprise, "Of course, the upper limit is three thousand Galleons."

"One year?"

"Seven years." The goblin chuckled, showing his yellow teeth.

"That's too little." Erwin frowned, "Why set an upper limit?"

Just the basic cost mentioned by Professor McGonagall is over a thousand Galleons in seven years.

"Because this exchange ratio is simply giving you money." The goblin raised his nose mockingly, "If it were not required by the Ministry of Magic, Gringotts would not provide such a purely welfare service. Muggle money is too valuable.

If it’s too low, it’s basically like useless paper.”

This race is indeed as legendary as they regard money and wealth as their top priority.

"Okay," Erwin sighed. He could understand that after all, the productivity of ordinary people was too low compared to wizards, "Then I will exchange it for three thousand Galleons."

"Are you sure? If you accidentally spend all your money in the past seven years, we will not exchange it for you for even one Knut. Then you will have to borrow money." The goblin smiled maliciously.

"Sure." Erwin said without hesitation.

These credits are meaningless if not exchanged. Erwin now needs enough gold coins as his start-up capital in the wizarding world.

Under the surprised gazes of the Granger family, Professor Stewart opened the briefcase he carried with him with a rather stiff expression and took out a thick stack of banknotes. After all, he was the guardian in name, and he had to pay the bills.

"The letter said to prepare enough money," Professor Stewart explained to his daughter with some embarrassment: "I brought more to prepare for emergencies..."

Of course, I brought more than "some". There was fifty thousand pounds in that briefcase, but I didn't expect that I could only exchange less than half of it.

"Are you really going to let him take all the money to school at once?" Mrs. Granger looked in disbelief.

"Of course not." Professor Stewart laughed, "Erwin is a sensible child, and he already has a sound sense of values ​​and money."

The poor old man had never told a few lies in his life, but now he had to clumsily cover up for Erwin.

The goblin Gasly on the counter rang the bell, and soon another one came over pushing a small cart with Erwin's gold coins on it.

After seeing this golden hill, Erwin realized that he had overlooked an issue, that is, galleons are physical currency, and each gold coin is of sufficient weight.

Mr. Granger was already struggling to hold the bag containing three hundred galleons. Three thousand galleons was a weight that they could not carry away with bare hands, unless Erwin was willing to show it in front of a Hogwarts professor.

He naturally knows how to perform the "stickless and silent floating spell".

Gasly at the counter smiled happily, "You can deposit this money into Gringotts immediately. It only requires a 2% annual storage fee."

"Storage fee?" Erwin thought he heard wrongly, "I keep my money here and I still have to pay for it?" He thought it was ridiculous.

What an extremely backward business model. Is this the result of financial monopoly? How incompetent are the people in the Ministry of Magic to allow goblins to establish the only bank? This is almost equivalent to sending the leeks of the entire British wizarding world to them!

However, Erwin is just a new student at Hogwarts now. No matter how much wealth the Frost family has, the support they can give him is only three thousand galleons. It is best for him to accept any form of exploitation obediently and show his indifference first.

Harmful look.

"If you don't save it, then I can't help you." The goblin clerk spread his hands, "Perhaps you can consider buying this trolley. It is a Gringotts standard transport truck and is durable..."

However, this time Professor McGonagall spoke up. She had always adhered to her duties as a teacher and did not express any opinions on the internal affairs of students' families. "I suggest you buy a suitcase first, Erwin. This is also your responsibility."

It’s on your shopping list. One that’s been charmed with an invisible stretching charm can easily hold all your possessions.”

Professor McGonagall said while giving the goblin clerk a stern look, "You should be able to keep these gold coins while we go to buy suitcases."

"Of course..." Gasly smiled awkwardly.