But don't forget.

This is the year 1100 AD.

A feudal era that didn't even have a standard understanding of electricity.

Old Su was able to make such a judgment by observing a generator; he's really amazing, huh!

Although Old Su was still far from truly understanding the principles of magnetism generating electricity.

His words basically summarized the two key elements of electromagnetism:

Closed circuit, the angle between the direction of conductor movement and the direction of the magnetic field lines is not zero.

Apart from here.

Old Su's last sentence pinpointed the essence of magnetism generating electricity:

Magnetic power generation is electricity transfer, converting kinetic energy into electrical energy, causing electrons to move closer or farther.

Coulomb's force works to generate an induced current in the conductor.

If Xu Yun had to evaluate, Old Su is simply a.....

Monster!

That's right, a monster!

He then took a deep breath and said to Old Su:

"Sir, your analysis is very close to the truth of the generator, but the specific concept involves something called a current. Since Lord Middle Marquis is still ill, should we first..."

Old Su lifted his eyelids and gave him a glance, then pondered for a moment and asked:

"Xiaowang, are you very familiar with current?"

"Just a little, just a little."

Old Su nodded slightly, noted it in his heart, and then said:

"If that's the case, then let's first perform a venous injection for Zheng Ru. See if the box over there contains what you're looking for, the 'prickly basket'?"

Xu Yun looked accordingly.

He discovered that Old Su was pointing at a wooden water box about 30 centimeters high.

He then walked to the water box and found several red sea urchins quietly resting at the bottom.

As a biology PhD and Japanese cuisine enthusiast, Xu Yun immediately recognized the species of these sea urchins upon seeing them:

No doubt about it.

They were indeed Red Sea Urchins!

With the species confirmed, the rest was simple:

He first took one of the Red Sea Urchin spines, cleaned and disinfected it with alcohol, and then applied molten silver water on the surface.

Then, during the time the silver water was solidifying, he took out 120 milligrams of pre-prepared garlic ethanol solution, mixed it with 1000ml of saline, and stirred it well.

Just like that.

A simple garlic injection solution was prepared.

After about a quarter of an hour.

The silver water had solidified completely.

Xu Yun then took a silver syringe from Old Su—this device was made by Old Su according to the diagram provided, featuring a small locking switch at the interface.

Xu Yun opened the switch and inserted the needle tip from the top of the tube.

Angled to the liquid, the needle tip was formed into an oblique conical shape.

Hence, when the needle tip emerged from the bottom about 90% of the way, the rest, which was too large to pass through, remained inside the tube.

Xu Yun closed the latch to secure the needle tip completely.

Thus.

A silver-made ancient syringe was finished.

Having completed these, Xu Yun followed Old Su into the room.

At this moment, Wang Yue was still asleep, but both his complexion and breathing made it clear that the Lord Middle Marquis was out of danger.

One could even hear slight snoring, clearly dreaming sweet dreams.

Seeing Xu Yun and Old Su enter, Wang Bing, who had been keeping watch beside the bed, quickly got up and cupped his hands toward the two:

"Uncle, Xiaowang, you're here."

Xu Yun returned the courtesy, then shook the needle in his hand and said:

"Captain, the injection solution is ready, may we proceed with the injection now?"

Wang Bing immediately stepped aside, as his trust in Xu Yun had reached a considerable level:

"Please do."

Xu Yun stepped forward and first conducted a simple skin test on Wang Yue.

Twenty minutes later.

There was no abnormal reaction at Wang Yue's test site.

In other words, the skin test was negative, indicating no allergy.

Seeing this, Xu Yun glanced at Old Su and Wang Bing:

"Sir, Captain, the body of Lord Middle Marquis can accept the venous injection, then.... shall I begin?"

Old Su nodded:

"Go ahead."

Upon hearing this, Xu Yun took a deep breath, drew the medication into the syringe, and expelled the air.

At the same time, he tied a makeshift tourniquet to Wang Yue, taking hold of his left hand.

Locating the vein, he started the slow push injection.

With ease, the Red Sea Urchin's spine pierced through Wang Yue's skin and entered the blood vessel.

Xu Yun pushed the injection very slowly, being extremely cautious throughout.

After a few minutes.

Upon completing the garlic solution injection, Xu Yun's expression remained tense.

He knew that now was the most perilous moment.

While intravenous injections enable antibiotics to take effect quickly, they also entail considerable risk.

For instance, there could be infusion reactions, or excessive medication particles might cause local blockages and insufficient blood supply.

Further leading to tissue hypoxia, edema, phlebitis, and so on...

The single advantage Wang Yue had was that he was an ancient soldier.

His physical condition was much better compared to ordinary people, and he had no developed resistance to drugs from modern times.

A quarter of an hour passed.

Wang Yue remained in good condition.

A half quarter...

A half hour...

An hour...

Two hours later.

Wang Yue still showed no abnormalities, and Old Su even took his pulse himself, noticing it was steadily stabilizing.

Clearly.

The intravenous injection.....

Was successful.

........

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