"Drive!" A crisp sound sounded in the cold wind.

It was a frozen dirt road, and it was an ordinary carriage on the dirt road, and a boy of sixteen or seventeen years old, wearing a gray cotton jacket, was sitting on the wheel, waving a whip in his hand, and drove the two horses running in front.

"Master, it's almost time to reach Zhongnan Mountain in front, should we go to visit Yuan Tianshi first, or go to Chang'an to face the saint first?" The boy looks very delicate, and there is a sense of indifference between his eyebrows, although the weather is already cold, but the boy does not look cold at all, and the thick cotton linen clothes are very tight.

"Let's go to Zhongnan Mountain to see Lao Yuan first, the old man hasn't seen him for a long time." A sturdy old man's voice came from the carriage, "By the way, Yu'er, change to Nie'er to drive, you come in to keep warm." ”

When the young man heard this, he rubbed his hands excitedly, and said angrily: "Senior Brother Nie, then I will change you to drive." ”

The curtain of the carriage was opened, and a young man in a white cotton coat also came out, this young man had thick eyebrows and starry eyes, a resolute face, and he was also a rare beautiful man.

"Xiaozhuang, you go to get warm first, I'll drive." The boy's voice is also very crisp.

"Okay, Senior Brother Xie." The young man who was called Xiaozhuang screamed and got into the carriage.

The carriage was spacious, a small cylindrical stove was burning slowly, and an old man who looked to be about forty years old was sitting by the fire, holding a strange book in his hand and studying it carefully. The boy first took off the cotton hand guard on his hand, and put his little hand, which was a little red from the cold, close to the fire to warm it.

The young man roasted for a while, felt obviously more comfortable, then became bored, scratched his ears and looked at it for a while, and finally approached the old man and asked, "Master, you have been reading this book for more than half a month, what does it say?" Every time I see you reading a book so fascinated, my brother and I want to see what kind of book it is. ”

The old man stroked his beard, did not answer, but pointed to the stove, and said slowly: "Add another piece of honeycomb coal." ”

"Oh." The boy turned on the stove with some displeasure, took out a piece of burned honeycomb coal, put it into a nearby iron furnace, and then clamped a new piece of coal with tongs and loaded it into the stove.

When the young man finished finishing, the old man suddenly put down the book and sighed softly: "The old man doesn't let the two of you read this book, and there is a reason for the old man, because of the various medical theories described in this book, even the old man was shocked when he read it for the first time, and he really didn't dare to believe it, let alone show it to you and Nie Er, in case he misled people's children." ”

When the young man heard this, he seemed to be greatly surprised, and his eyes stared at the book curiously, and asked, "Master, is there any medical theory in this world that you don't know?" ”

Sun Simiao nodded and said, "Yu'er, the sea of learning is endless, and the medical journey is boundless, if you want to be a qualified doctor, you must keep learning, and being a teacher is naturally no exception." ”

The young man nodded as if he didn't understand, as if he thought of something and asked, "Master, which medical master can write this book?" ”

When Sun Simiao heard this, he paused for a long time before his voice came out of the carriage.

"Ghost Valley!"

In winter, Zhongnan Mountain seems to have no life, everything is silent, and the unmelted snow still decorates the entire forest, and between a piece of silver, it is a black road that leads directly to the Zongsheng Palace.

A carriage was driving fast on the black road, it was Sun Simiao's carriage.

The carriage was moving very fast, and the gate of the Zongsheng Palace built against the mountain soon came into view, and the young man in white cotton clothes driving in front of the carriage shouted from the overtaking carriage, "Master, junior brother, we will go to the Zongsheng Palace in front." ”

There was a burst of young man's cheers in the carriage, and a young man in a gray cotton jacket poked his head out, looked at the gate of the Zongsheng Palace in front of him, and laughed again before he got into the carriage again.

The carriage began to slow down from afar, and when it reached the gate of the mountain at the foot of the Zongsheng Palace, a male voice was heard: "Who is visiting the Zongsheng Palace?" ”

"Senior Brother Dao Nian, Senior Brother Dao Ask, it's me, Dao Nie." Dao Nie, who was dressed in white cotton clothes, jumped out of the carriage and greeted the two Taoist priests guarding the gate in front of the mountain gate of the Holy Palace of Zongzong.

"Oh, it turned out to be Senior Brother Dao Nie!" The older Taoist priest said with some surprise, "After three years, I didn't expect that my junior brother and junior brother would grow so big this time!" Dao Nian's tone was also full of joy.

"Senior Brother Dao Nian, Senior Brother Dao Question, have you forgotten me?" The young man in gray cotton clothes also jumped out of the carriage impatiently and shouted at the two men.

"Little junior brother of Daozhuang!" The two Taoist priests shouted in unison, three years ago, this little junior brother was the living treasure of the Zongsheng Palace, and many Taoist priests liked to take care of the junior disciple the most.

"After three years, even the youngest junior brother of the Zongsheng Palace has grown so big." Senior Brother Daowen also walked up and touched Daozhuang's head and sighed. "The little junior brother is also here, and the person sitting in the carriage must be Sun Daochang." There was a sense of respect in his questioning tone.

"Hehe, there are still people who are worried about the old man." Sun Simiao also got off the carriage along the wheel, "What about Lao Yuan?" Is he, this old boy, in the Zongsheng Palace? ”

Dao Nian arched his hand and said, "Yuan Tianshi and Senior Brother Li Chunfeng are in the chemical practice room, and Sun Daochang can be seen when he goes up the mountain. ”

"Chemistry room?" Sun Simiao was stunned for a moment, "What is this?" ”

"Oh, Daoist Sun doesn't know, this chemistry room is a long hall recently built by Yuan Tianshi, and the more intelligent young disciples of the Zongsheng Palace have all entered the study, and I heard that they are studying some magic techniques that fly to the sky and live forever."

"Immortality?" When Sun Simiao heard this, his face instantly became a little gloomy, "Ridiculous! He flicked his robe and headed up the hill.

Dao Nie saluted the two senior brothers guarding the mountain and followed the master towards the mountain, while Dao Zhuang just stuck out his tongue at the two senior brothers and chased after them.

As a healer, Sun Simiao's understanding of human beings as an animal is extraordinary, birth, old age, sickness and death, grass and trees withered, he does not believe in what can achieve immortality, when he heard that his old friend was studying the art of immortality. The first thought was to hurry up the hill to stop it, which was not the right way.

The six hundred and sixty stone steps of Zongsheng Palace, it is not low to say that it is low, at least after climbing, Daozhuang and Dao Nie are already out of breath, but Sun Simiao seems to be like no one, it can be seen that the way of health has been superb, along the way, there are Taoist priests who come up to salute Sun Simiao, Lao Sun is also a little anxious, nodding slightly as a return gift, asking the location of the chemical real room, and where to go.

Pushing open the door of the chemical room, a pungent smell came to his face, Dao Zhuang and Dao Nie choked and covered their noses, Lao Sun frowned, and walked in.

This chemical real room is a long hall, Yuan Tiangang and Li Chunfeng should be in the innermost, so at this time, there is no one in the outer hall, and Lao Sun walked towards the hall with two disciples.

Along the way, there were strange glassware everywhere, containing liquids of different colors, and Daozhuang kept looking east and west, as if he was full of curiosity about this chemical room.

Walking further inside, a solemn voice was heard, "Ladies and gentlemen, please this glass, and five hours ago, under your witness, a whole broken shell of an egg was put into the poor road. There were a lot of bubbles in the eggshell at that time, and now that five hours have passed, you and Poor Dao have come to see the changes in this eggshell. ”

Lao Sun had already walked into the hall at this time, and what he saw was a high platform, behind the stage was a black wall panel and a large stove, and a chimney was inserted on the stove to go straight to the outside of the hall, Yuan Tiangang was standing on the high platform at this time, holding a glass filled with black liquid in his hand, and there were many young disciples wearing Taoist robes sitting under the stage.

Lao Yuan didn't see Sun Simiao come in, he was still concentrating on doing his own thing, I saw him cover one cup with gauze, and then pour another cup of vinegar soaked in eggshells into it, but after pouring it, no trace of eggshells was found on the gauze, and the Taoist priests in the entire hall were stunned, and Sun Simiao was also very curious.

"Ladies and gentlemen, as you can see, the eggshell is gone, and perhaps you are a miracle, but this qiē can be explained by chemistry." Yuan Tiangang said with confidence on his face, at this time, his white beard was fluttering, and his robe was brilliant, like a god descending to earth.

I saw him pick up a small white lime and write on the big blackboard behind him: "CaCO3+2CH3COOH=Ca(CH3COO)2+CO2↑+H2O"

Facing the stunned crowd in the audience, Yuan Tiangang showed a satisfied smile and said: "This is the reaction equation between limestone and acid, which is the cosmic theorem that has been rigorously calculated by my chemistry laboratory, and it is exactly the same as that calculated by the disciples of Guigu. ”

"It's also a ghost valley?" A voice sounded in the audience, and everyone looked in that direction, only to see an old man staring at the stage with blazing eyes. RS