Memory is a very wonderful thing. If the owner himself has forgotten, then Felix can do very little.

This is different from the situation of the Longbottoms - he is not looking for a specific treasure, but piecing together as many memories as possible, not sticking to a certain day or a certain event. Anyway, in his view, they are all bricks to build a building of thinking.

With Lupin's participation, Felix's analysis of the Marauder's Map is on the right track. In a few days, he will be able to add the alarm spell.

...

Gryffindor common room.

In a remote corner, Harry, Ron and Hermione sat at a small round table.

"Try it, Harry," Ron urged, "Let's see the ghost book."

"It's the nameless book." Hermione corrected habitually, her eyes fixed on the table, where there was a transparent book with a blue-white glow.

"Don't you think the name of the ghost book is more appropriate?"

Harry looked at the two, and his heart tightened for no reason. He reached out and opened the nameless book. Professor Happ's figure was half hidden and half revealed in a light blue mist. He took a deep breath and pressed his palm on the page.

Ron and Hermione noticed that Harry suddenly stopped moving, his expression frozen. Ron reached out his hand, "Don't move!" Hermione said, she thought of the function of the mind cabin, "Harry's consciousness may have entered this book."

Ron looked at Hermione in astonishment, then looked at the book on the table: "Is Harry's consciousness in here?" He held his breath and leaned over to check, trying to find something on the page, and he really saw a small, blurry Harry.

"Merlin's socks!"

Ron looked around with a little horror, and Hermione's eyes were firmly fixed on the page, "Don't be startled, Harry is fine."

"What if someone touches Harry and makes him move his hand away, will he be trapped in the book?" Ron suggested sincerely: "Should we help press his hand?"

Hermione hesitated, "I don't think it can be so dangerous..." Half a minute later, she was successfully persuaded, and she and Ron stretched out their hands, one on each side, and pressed on Harry's hand.

The next second, the world was spinning -

"Ahhhh!" Ron screamed. He seemed to have fallen into a long tunnel, shaking helplessly. He couldn't help but think of the scene of jumping into the tunnel of the Chamber of Secrets last year.

"Please, stop screaming, Ron."

Hermione said on the side. Ron opened his eyes and slowly got up from the ground. "Where is this?"

The sky and the ground under his feet were unreal and illusory, as if they were condensed with light blue smoke. He stomped his feet, and a cloud of mist exploded from the ground, causing him to stumble.

"I think this is the world in the book. Look over there!"

Hermione pointed in the opposite direction of Ron. He turned around and saw the figures of Harry and Professor Happ.

Not far away, Harry was staring at them in amazement. He trotted over: "Why are you here? No, you can come in too?"

"We saw that you suddenly stopped moving, so we wanted to help you... uh, maybe we thought too much." Ron looked around excitedly: "It seems that the professor did not refuse others to enter here. It's really big here..."

"I asked the same question," Harry said, "The professor's answer is that space has no meaning in the world of thought."

"Follow me!"

Ron and Hermione followed Harry to the place they had just been. Professor Hepp seemed to have heard nothing of what had happened before, and continued to narrate slowly.

"...We've talked about goals and determination, now the next thing is to be calm. When performing Apparition, don't be nervous or afraid. In other words, don't be distracted. Distraction is the main reason for failure of movement or even separation. It will affect your concentration on the goal and the firmness of your determination..."

Harry was stunned for a moment, "I missed the second point... But it doesn't matter, I can repeat the study."

Ron said in admiration: "How cool! Is all this fictional?" He tentatively stretched out his arm and passed through the professor's illusory body, "It's so real..."

"Crack!"

"Ouch!"

The light blue mist in the air condensed into a bolt of lightning, which directly struck Ron and made him fall down, and his hair stood up.

"I think," Harry held back his laughter and pulled Ron up, "The professor doesn't like people getting too close to him."

Ron looked at Professor Hep guiltily. He had stopped and muttered, "Ron Weasley, this won't happen again."

Ron's eyes widened, "He, he, he..."

Hermione looked at him for a long time and said hesitantly, "It should be a fixed procedure, just like the professor's magic puppets, with a certain degree of autonomy. But when Harry returns the book, it's hard to say whether the professor will know."

Ron said with a bitter face, "I'm really just curious."

Professor Hep, who was standing next to them, finished talking about this part while they were talking.

"...We have finished talking about the most basic knowledge. The first test content is that I need you to repeat what you just said. It's actually very simple. Even if you have a little understanding, you won't make mistakes."

Harry hesitated for a long time. He did read some materials in advance.

"Well, let me think... learning to Apparate requires following the three D principles, namely, goal, determination and calmness. First, we must focus our consciousness on the place we want to go, that is, the goal; we must know it well enough, it can be a place you have been to, or within the range of vision..."

Harry stroked his hair, "Then there is determination - I didn't hear it clearly just now, but... I read in the book that when using Apparition, you must have a strong desire, let this desire fill your body, and mobilize magic power along the way."

"Finally, there is calmness. The book says to turn in circles, but you didn't mention it just now, and I don't think you really need to turn in circles... Ahem! In short, imagine that your body becomes nothingness, and don't be distracted by other things." After

Harry finished speaking, he looked at Professor Hep with expectation.

Professor Hep smiled at him approvingly: "Very good, Harry."

Harry still couldn't help but feel surprised. Was the professor in front of him really just a memory? He could even fight back against Ron's behavior. Even if Hermione said that this was set in advance, he still doubted it.

"So, next--"

"Wait, Professor, can they learn it?"

"They?" Professor Happ looked at Ron and Hermione, "Do you want to try it?"

"Can I, Professor?" Hermione asked in surprise.

"When I was leaving my memory, I considered that Harry might let you study together. However, Harry's progress should be the main priority. You can't surpass him or help him pass the level."

Ron hesitated, "How about letting Hermione try? I'm not even proficient in the spells taught in the dueling class."

"It's okay, Ron, we have many chances." Harry encouraged him.

After more than ten minutes, they completed this step. Ron listened to it twice before repeating it clearly. When Professor Hep nodded at him, he breathed a sigh of relief.

"I'm more serious than in class, really!" Ron said. He didn't want to hold himself back and delay Harry's learning progress.

"Next, it's the second level." Professor Hep said according to the scheduled memory, "You should like it, follower apparition."

"Follower apparition?" Harry heard a new word.

"You can bring someone with you when you Apparate. The one being brought along is the follower, and this method of movement is called Follower Apparition. During the war years, the Ministry of Magic once recommended that every child learn Follower Apparition. It's actually very simple. As long as you don't shout or suddenly burst into magical confrontation, you can basically succeed."

Harry nodded and asked, "Should I repeat this content? Is this the second level?"

"No, Harry." Professor Happ showed a bright smile, "Just now it was a background introduction. The real test is to adapt to the discomfort of Follower Apparition."

"I think that when you adapt, you will have a more realistic experience of the magic of Apparition."

He looked at the three people, "Since you all want to learn it, um... let's do it randomly."

His figure suddenly disappeared and appeared in front of Ron. Ron opened his mouth in slow motion, his eyes bulged, and Professor Happ's palm quickly enlarged in front of his eyes...

The next second, the two people's bodies twisted and disappeared.

"Professor?" Harry whispered, looking around, there was only a faint blue mist around.

Hermione said, "The professor should be taking Ron to experience the feeling of the attendant's appearance."

"Experience?" "

After all, all this is fake, a world constructed by the mind. You can't mobilize magic, and you can't form facts and habits." Hermione said very experienced.

After two or three minutes, "Ahhh——" Professor Hepp took Ron out of the air.

Ron was panting, with fear in his eyes. It took him a long time to come back to his senses, "I feel like I am desperately squeezing out of a rubber tube, and I may be compressed into a walnut at any time..."

But after a while, he encouraged Harry and Hermione to try, "That feeling is unforgettable, you definitely don't want to miss it."

Professor Hepp took a step forward at the right time and said with a smile, "Who's next?"

Harry and Hermione stepped back together. The professor's smile was really scary.