Ask Sword

  Chapter 54 Variables

   Li Ang raised his eyebrows in surprise, Song Shaoyuan and the others also frowned, looking in the direction of the voice with displeasure.

  In the box next door to the restaurant, Qiu Jing, the medical officer of the Imperial Medical Office with the badge of Taiji Palace Accomplishment hanging on his waist, could not help shaking his head and smiling wryly as he looked at his friend dressed as a Confucian scholar in blue and looking sullen on the other side of the table.

It's no wonder that the middle-aged man who was sitting opposite Qiu Jing showed displeasure. On the table between the two of them was a huge city map of Chang'an, which described in detail the city, canals, wells, Scenes of fields, streets, bridges, and even palaces.

   Chang'an map, or map,

  Ordinary citizens are not qualified to hide or even contact them, because they will be suspected of intending to rebel.

  But the Confucian scholar in Tsing Yi has no such concerns at all—his name is Tantai Leshan, and he is one of the Si Ye doctors who teach Talisman and Engineering in the academy.

  This map is the renovation drawing designed by Tantai Leshan and his students at the invitation of the Ministry of Industry and Commerce of Shangshu Province for Chang'an City.

   "Brother Leshan"

  Qiu Jing coughed lightly, he knew very well how much effort Tantai Leshan had put into the renovation drawings of Chang'an City during this period.

Transportation, housing, drinking water, transportation, and city defense for three million people. In order to facilitate the people in the city to the greatest extent, Tantai Leshan and his students inspected every corner of Chang'an City, repeatedly discussing, deliberating, experimenting, and improving all issues. ,

  This map is the brainchild of Tantai Leshan over the past year.

   What's more, he also mentioned his favorite water canal system that will cover all parts of Chang'an in the future.

  However, the person sitting next to them was obviously the student who came from other places this year and was preparing to take the school exam.

  The two of them, one is the medical officer of the imperial medical office, and the other is the school secretary. It is inappropriate to accidentally overhear the conversation of the students next to them, and it would be even more embarrassing to come forward in person.

"Um."

  Tantai Leshan nodded, and gestured to the servant standing in the corner with his eyes, the latter immediately understood, quietly walked out of the door, came to the next door, and knocked on the door to apologize.

   "I'm really sorry for disturbing the feast of the scholars,"

   The servant cupped his hands and said, "It's just that my master simply wants to know why it is said that the more drainage ditches are built, the easier it is to breed diseases?"

   "Ah, it's nothing, we were just joking, sorry to disturb the neighbor."

  Yang Yu was keenly aware of the troubles coming, smiled and slapped haha, trying to fool him,

However, the servant moved his ears and continued to speak gently: "My master said that the way of learning for the disciples of the academy is to respect the rules of heaven and earth, make bold assumptions, and carefully prove. There is no absolute truth and authority, or truth and authority are based on come to constantly question and verify. If you think something is unreasonable, you can point it out directly and discuss it rationally.”

  Yang Yu's eyelids twitched,

   There are many big families in Chang'an City, but not all of them can have such eloquent servants who can speak casually about the purpose of studying in the palace.

   No matter who is sitting next door, it is trouble.

  For a while, no one in the box spoke, and the scene suddenly became cold, only the sound of Chai Cuiqiao chewing ribs remained.

   crunch.

Maybe it was because Chai Cuiqiao chewed the bones too loudly, Ji Linglang and others looked at Chai Cuiqiao subconsciously, which made her gradually realize that the surrounding atmosphere was not right, so she chewed the bones nervously and lowered her body a little. Tap the volume.

   crunch.

   Shame, shame.

   "Well, I said that sentence just now."

Li Ang put the chopsticks on the bowl, and said casually: ""The Yellow Emperor's Internal Classic, Plain Questions, Yin and Yang Yingxiang Dalun" says: the center produces dampness, dampness produces soil, soil produces sweetness, liver produces spleen, spleen produces meat, meat produces lungs, spleen Main mouth. Thinking hurts the spleen, anger beats thinking, dampness hurts the flesh, wind beats dampness, sweetness hurts the flesh, sourness beats sweetness.

  Since ancient times, people in the Central Plains have been afraid of low humidity and damp and cold environment, so they all hope to live as high as possible.

   Therefore, the land price in the north of Chang'an City, which has a higher terrain, is higher than that in the south of the city.

  This kind of phenomenon that citizens instinctively fear low humidity and low-lying areas is actually the result of long-term experience-living in high places is less likely to get sick than people living in low places.

   Everyone should be able to understand this, right? "

"Um."

  Before the others spoke, Yang Yu nodded.

   It is no secret that the land price in the north of Chang'an City is higher. In fact, the purpose of building the imperial palace on the high ground in the north of the city in the former Sui Dynasty was to keep away from dampness.

  In "On the Causes and Symptoms of Various Diseases Volume 1 Wind Arthralgia" compiled by former Sui physician Chao Yuanfang and others, it is stated that the causes of wind arthralgia include wind, dampness, and cold.

  The previous building standards of the Sui Imperial Palace could avoid wind and cold factors, but in order to avoid humidity, it was necessary to live in a cool place.

   "Low-lying, low-lying, and disease, these three words have been bound together for a long time.

  However, if it is believed that low-lying and low-lying dampness are the direct causes of disease,

  It is tantamount to arresting the blood-stained knife at the scene of the murder as a murderer by the police. "

  Li Ang said casually: "Low-lying and low-lying damp are the indirect causes of illness.

  The direct cause is water and grass.

   To be more precise, it is a mosquito attached to aquatic plants. "

   "Mosquitoes?"

  Everyone, including the servant, looked surprised. It is generally believed in the folk and medical circles that the reason people get sick is largely due to external evils entering the body.

  External evils, that is, external things that can harm people's body and mind, are nothing more than wind, cold, dampness, dryness, fire, and pestilence, etc., excluding mosquitoes.

   "Exactly."

  Li Ang nodded and said: "In the 22nd year of Jian'an, the disease was prevalent, and every family felt the pain of zombies, and every room felt the mourning of howling. Some died after closing their doors, or died after their family was destroyed.

  This horrible epidemic disease is malaria.

   the cause of malaria.

  I happened to hear a medical case from my father. In a certain place, there were twin brothers who married twin sisters. The two couples live next to each other, live in the same alley, work in the same place, and eat similar meals every day.

  In the fall, however, one of the couples died of malaria, while the other survived.

  If malaria is caused by external evils, why would another couple with such similar physiques and basically the same living environment be fine?

   After careful investigation, the only difference between the two couples,

   It was the family suffering from malaria, and they put a water tank in the yard, and usually got water from the water tank.

  The other household fetches water from the river every day.

  However, the water in the tank is also drawn from the river.

  Then there is only one difference between the two.

   That is, the larvae mosquitoes that grow attached to the water tank.

  When all the factors of the two scenarios are the same, only one factor is different, and the scenario results are different at the same time,

  The only factor that makes a difference is the variable that causes the determining effect.

   That is, control variables. "

  (end of this chapter)