Because the Midland version of the microscope is based on magic, unlike Earth's, it is nothing to observe multiple targets at the same time with one microscope. This Mystery version can even do the same thing as the earth's dissecting microscope, giving the observed samples a three-dimensional appearance.
However, Fen didn't intend to use such a complicated operation. The second sample she was going to present was the leaves she had previously ordered the apprentice to pick. With the same simple and neat movements, she skillfully removed the thin film from the lower epidermis and placed it on the stage after the same process.
With one animal sample and one plant sample, Fen explained the characteristics of each part of the cell and the differences between animals and plants. In order to allow everyone to understand cells more clearly, she also took epidermis, blood and other objects from someone's body and gave an introduction. It makes someone feel like they are being treated as a guinea pig, and this guinea pig also helps control the screen in class.
Just using one type of animal or plant cell would certainly not be able to delay the process for too long. After all, colleges in Midland do not have the pressure of exams like schools on Earth, so teachers have to say things like, 'This is the key point, it will come out in exams later' in class from time to time.
Teaching in Midland is more like the concept of giving a briefing on Earth, focusing on the key points, and then outputting a large amount of information. This is someone’s new experience after taking a few math courses.
Especially the people who come to take this kind of advanced courses are all magicians, they still have a solid foundation, they are not the kind of apprentices who have just received enlightenment. And those who can become official magicians have excellent memory and understanding abilities. To put it simply, it is the feeling of teaching top students. It's no wonder that when teaching in the Holy City, if you don't do well, you will be disgraced and kicked out.
The definition of good teaching is also very simple. Either the new content is shocking or subversive enough, or there is so much new content that others have no time to receive it. If you can do these two things, you will be a good teacher in the eyes of this group of academic masters.
So after talking about the basic differences and types of animal and plant cells, Fen directly introduced the cells in all parts of the human body. Including the differences and uses of each cell, the uses of the organs composed of cells, and the uses of the internal systems composed of these organs.
Then the gratifying thing is that the following introductions will all use pre-prepared pictures instead of collecting them on the spot. Someone thus escaped being quartered.
However, although this new knowledge was novel, it failed to touch the calm hearts of these old magicians. Everyone studied in class calmly, copying notes quietly. Of course, someone could guess this situation from the beginning. After all, the magicians in Lost Land all take the practical route. It's too purely academic, and it's hard not to make people wonder, 'What's the use of learning this?'
So with thirty minutes left in the first life lesson, the syllabus suggested by Lin takes a small turn. Fen's ability to control time is also very precise. Even if she doesn't look at the pocket watch - a magic gold pocket watch made by someone a long time ago, which is still one of the lich's trophies and cannot be taken back, woohoo - or the clock, she still You can say one hour and thirty minutes after class starts:
"The above is an introduction to the cells in various parts of the human body. Including humans, all creatures that can be seen on the Mysterious World can be classified as multicellular organisms. That is, each organism is composed of thousands of cells with different functions. Composed of cells. So the question comes again, are there single-celled organisms? They are organisms that have the ability to move, reproduce, etc. with a single cell."
Without waiting for anyone to answer, Fen asked again: "Excuse me, does anyone here have water?"
Although no one answered, none of the magicians opened their mouths to chant incantations, and they easily used an apprentice-level magic - water gathering spell, and condensed it into water balls in the air.
"Sorry, everyone, I didn't make it clear. What I need is drinkable spring water or well water, not water created by magic."
The water ball in the air disappeared silently. One of the magicians picked up a sheepskin water bag and said, "This is the spring water from the Fairy Spring in the forest. Can this water be used?"
The spring water of the Fairy Spring is one of the specialties of the holy city of Estali and a high-priced product. It is said that long-term drinking can help magicians accumulate power faster. However, people who are not suitable for it, or those who drink too much, may develop resistance symptoms.
"Okay, this is really good." Fen took out another empty petri dish, came to the magician who spoke, and said, "Please pour some on this glass dish, that's it."
Although the Fairy Spring was expensive, the volume of the small vessel seemed to be less than a mouthful. The magician who brought the spring water didn't care and poured it half full.
"Okay, everyone, this is the spring of the Fairy Spring. Let's take a look at what's in here."
Fen returned to the podium and placed the water in the petri dish directly on the stage of the microscope without doing any treatment. The next operation was carried out by herself, rather than by Lin, who was her assistant. The operation is not just a matter of microscopic magnification, but enables the analysis function and comparison of the program. Looking at the constantly updated data on the Water Mirror Technique screen, Fen smiled and said, "Haha, the world in the water is really exciting."
The analysis was very fast, and it was all completed in a short time. Fen said: "In the volume of water in the petri dish, which is about three to four milliliters, some different types of microorganisms were detected, most of them in small amounts. However, the most common one is this one--"
At this time, a large number of long, rod-shaped bacteria with rounded ends and no spores were displayed on the hydroscopic screen.
"─E. coli, which mainly lives in the large intestine of animals. Some strains are beneficial bacteria that can produce substances needed by the human body and prevent the growth of other pathogenic bacteria. However, some strains can cause food contamination, making eating Patients develop symptoms of food poisoning. Common manifestations include vomiting, abdominal pain and diarrhea. In addition to the intestinal tract of organisms, they are often found in environments contaminated by feces."
As soon as Fen's speech came out, everyone was in an uproar.
What a joke! This is the Fairy Spring, one of the most popular items among magicians in the Holy City. It can be used as a material for making props, and it can also be drank directly. The person who provided the Fairy Fountain was not an unknown young man, but a well-known veteran magician, so he could not have faked it or deliberately deceived people.
The water in the small glass dish was poured out of the sheepskin bag in front of everyone. Although it was brought to her strange machine for inspection through the lich, there was no chance of tampering with it in full view of the public.
So what's the point of saying that there are things in the water that can poison people? It’s even related to feces!
In the performance class where only Fen was present, someone finally spoke. The first question is: "Your Excellency Finny, have you made a mistake? How could there be something poisonous in the Fairy Spring? I have never heard of anyone dying from drinking the Fairy Fountain."
"What do you think 'poison' is? Something that will kill you if you simply eat it? Let me introduce another concept here, lethal dose. Everything is toxic, but the question is, how much does it take to kill someone. Some Things are highly poisonous, and even a little bit of powder will kill people if it touches the mouth. But some things are not like this, such as chronic poisons, which will continue to accumulate in the body. When the accumulated amount reaches a certain level, It will cause disease in the human body and lead to death. Although the operating mechanism of diseases is not exactly the same as that of poisons, generally speaking, there are still some reference points."
"What do you mean?"
"I call these single-celled organisms bacteria. Bacteria are everywhere, but there may be more or less after ingestion into the human body. In small amounts, the body's immune system will automatically eliminate these disease-causing bacteria. But if the amount is When too many are eliminated in time, they will induce symptoms in the human body, which is the so-called illness. As for yourselves, no one has become unwell because of drinking the fairy spring? Especially the characteristics I just talked about similar."
"This..." The magician who asked the question was speechless for a moment. Because the symptoms Fen just mentioned are actually resistance symptoms that occur in those who are not suitable. In the end, he could only reluctantly defend himself: "Is this all just admonishment?"
Fen was not angry at the distrustful questions raised by others and the suspicious looks from others. Instead, he nodded towards Lin and began to show pictures one by one.
The first picture is of a semi-abandoned village, with dead bodies lying everywhere. The few people who seemed to be alive looked miserable. The deceased did not die from war or monsters. There were abscesses of various sizes on his face and body, and the ends of his limbs were black.
With just one glance, everyone present recognized the disease as the infamous Black Death, the bubonic plague.
"This is a record I made after I accidentally heard about a plague somewhere during my travels and went to observe it. Most people think that this infectious disease is spread by rats. In fact, there are two vectors of infection, besides rats. , and fleas, but they only serve as bridges for disease transmission. The main pathogen is──"
Lin duly changed the picture.
"─Yersinia pestis, which is very similar to the E. coli shown before, but the bacteria are longer and segmented, and they belong to diplococcus bacteria. The cause is excessive decline after drought, causing massive growth of plants, herbivores and As a result, insects proliferated in large numbers, and rats also multiplied in large numbers because of the increase in food, exceeding the number that the rat feeders could control, and then the disaster expanded. The method of prevention is to prevent rats, exterminate rats, and eliminate fleas, and do not approach infected animals. People, avoid continuing to spread germs.──”
The next picture shows another ruined village. There are also dead people, but unlike the villages where people died of the plague, the faces of the dead here are haggard, as if they have withered.
"─This is another village that is infected with a type of plague, which I call cholera. The main characteristics of those infected are diarrhea, dehydration, vomiting, muscle twitching, etc., which in turn leads to sunken eye sockets, clammy skin and Inelastic. The main mode of transmission is through water or food contaminated by the patient's feces. The method of prevention is simply to isolate the sick and drink clean water. The main pathogen is─"
Another picture.
"──Vibrio cholerae. The bacterium is short, but has a single flagellum, pili, and some are capsule. There is no good treatment method. The only thing to pay attention to is to avoid dehydration of the patient. Therefore, we can only constantly replenish water and wait for the patient Get through this on your own.”
After that, Fen went on to show several infectious diseases of plague level, as well as the bacteria that were the main focus. Now, the masters at the bottom can’t sit still!
