From a domain perspective.

Although the Song Dynasty in 1100 had yet to establish a complete scientific nurturing system, let alone the so-called scientific literacy.

But it was in such a relatively ignorant and chaotic historical context.

Old Su still made the most appropriate decision upon observing the cell surface for the first time:

Engraving the image.

No other choice.

After all, in the past few decades.

Whether drawing star maps, compiling the "Herbal Atlas" or writing the "New Astronomical Instrument Manual", illustrations were an indispensable core part.

To use a later JOJO meme... it's drawing.

This has become a natural instinct engraved in Old Su's DNA.

A quarter of an hour later.

The Old Chief Steward returned to the courtyard with a small box and handed it over to Old Su:

"Master, the paper and pen are here."

Old Su nodded and took the paper and pen.

While instructing the Old Chief Steward to grind ink, he spread the paper on the stone table.

Since the time was relatively tight, Xu Yun hadn't had the chance to make a ballpoint pen these days.

Therefore, Old Su could only use a fine-tipped brush this time, which was slightly more difficult to draw with compared to the ballpoint pen.

However, since Old Su could be promoted to Prime Minister, his literary cultivation was very solid.

For example, in the "New Astronomical Instrument Manual", there were many pictures drawn by him, far superior to Little Niu's soulful art.

He took a few glances through the magnifying glass, then withdrew from the eyepiece and began drawing on the paper with a fine brush.

After drawing a few strokes, he returned to the magnifying glass, repeating this process many times.

Seeing this, Xu Yun and the others didn't say much.

Nor did they complain about Old Su occupying the resource by himself, demanding him to make way or anything.

Given Old Su's status, even if he fiddled with the microscope all night long, it wouldn't matter.

Just like that.

Half an hour passed in the blink of an eye.

Half an hour later.

Old Su put down the brush, exhaled a breath of turbid air with some fatigue, and a few beads of sweat could faintly be seen on his forehead.

The paper in front of him was now filled with a large number of strange and peculiar shapes.

There were rectangles, squares, ovals.

And also long strips like tadpoles, triangles, and bizarre shapes reminiscent of mutated Neon People, etc....

Then Old Su calmed his breath and accepted a cup of tea from the Old Chief Steward by his side.

He took a light sip and gave the position to the impatient Xiaoli.

He himself picked up the paper and blew on it, then asked Xu Yun:

"Xiaowang, I've drawn all the particles within the microscope onto the paper. Are these particles perhaps microorganisms?"

Xu Yun thought for a moment and shook his head:

"Strictly speaking... you're about seventy percent correct."

He looked at Old Su, whose expression was 'only seventy percent', and continued to explain:

"Master, there are many types of particles in sewage, possibly hundreds or even thousands.

For instance, there are muscle fibers, red blood cells, white blood cells, Campylobacter, Escherichia coli, yeast, and so on."

As he spoke, he walked over to the drawing, pointing at one of the larger particles:

"This here is a starch granule. It is one of the normal metabolic products in feces, like muscle fibers and fats.

Hmm... though the number of granules in this sample seems a bit large.

It's likely that this donkey's stomach isn't quite healthy; it might benefit from more exercise to help its digestion.

In summary.

These starch granules cannot be considered life; they are merely material."

Old Su nodded somewhat in understanding, having heard Xu Yun introduce the concept of material when discussing allicin:

"I see."

Then Xu Yun moved his finger to point at another small dot.

Although Old Su's drawings weren't colored, the quantity and appearance made it easy to discern its origin:

"This is a white blood cell, a common type of cell in animal bodies.

According to the records of the Wind Spirit Moon Shadow Sect, this cell serves as a crucial defensive barrier in the human body, capable of devouring pathogens.

However, if the count is too large, it may cause a kind of blood syndrome.

People suffering from this disease often experience body heat; various body parts easily bleed, rendering medicine ineffective....."

Blood syndrome.

A term anciently used for leukemia.

Of course.

Due to the ancient understanding of medicine, conditions related to blood were basically all classified under blood syndrome.

Strictly speaking.

Leukemia and blood syndrome share a subset and set relationship and cannot be equated.

But Xu Yun didn't deliberately correct this point, as some concepts are best discovered by Old Su or his descendants themselves.

After all, with the miraculous tool of the microscope, the future development of medicine is foreseeable with the naked eye—at least in the short term.

The discovery and classification of symptoms like leukemia and bacteremia are merely a matter of time.

And while Old Su was working to grasp these concepts.

The ever-silent Wang Yue looked at the engravings, his cheeks twitching, unable to resist speaking:

"Xiaowang, according to what you've said, sewage contains a large number of path... pathogenic bacteria, right?"

Xu Yun nodded:

"That's correct, sewage is among the materials with the highest number of pathogenic bacteria."

Wang Yue asked further:

"Then Xiaowang, the illness Mr. Wang contracted back then, what kind of bacteria caused it? Is it on the drawing?"

During his questioning, Wang Yue never took his eyes off the paper, seemingly wanting to pull out the bacteria and fight it for three hundred rounds.

Seeing this, Xu Yun couldn't help but laugh and explained:

"Lord Middle Marquis, what you had was bacteremia, which can be caused by various pathogens.

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