The drawings were given to Donghai, which was nothing to Xu Xiang.

He knew that with the drawings, the craftsmen of the East China Sea would be able to draw scoops from gourds and make earthen guns.

The East China Sea is near the sea, except for Mount Tai, there are generally mountain and stone veins in other places. Saltpeter is a rare ore in the East China Sea, and it is almost impossible to manufacture it in large quantities by arming the army to the East China Sea.

The reason why he didn't leave immediately with Jiang Shenyu was because he had to make some preparations before leaving.

First of all, in the Sanhe Street ring competition, in addition to the East China Sea and Beimeng, the secret spies of other forces are also known. Then the technology he has mastered will be coveted by everyone, and although Donghai gets the drawings, he will inevitably make them secretly and block the news. What he had to do was to let the news that Donghai had obtained the blueprints of the mysterious weapon naturally spread out and diverted their attention.

Secondly, Donghai will definitely not easily let himself leave with Jiang Shenyu, even if Jiang Zhen has already agreed to it himself. So he had to find a suitable opportunity to leave, and leave Tokai with no time to track him down.

Third, the origin and function of his jade pendant, all he knows is known to Ning Zhou, and he must figure out this matter.

Also, he realizes that if he wants to survive in this world, he must have his own power, so he must make a plan for his future after leaving.

"Your Highness, someone is secretly following, should we go back directly now?" After leaving the palace, the three of them turned into a remote alley, and Yang Dianfeng reminded in a low voice.

"Just let them follow, go find Lu Tianyao first." Seeing Ningzhou, he must not be able to see it so swaggeringly, he can only look for opportunities at night, this will be more than two hours away from the evening, and he has to do something to pass the time, he thought of Mrs. Lu and the little girl who were rescued by himself.

Before he made a big fuss with the wedding ceremony of the Hou Mansion, Yang Dianfeng and Xu Yi had already sent Mrs. Lu's mother and daughter back, so they naturally knew where they lived.

The three of them walked all the way to a sparsely populated street in the southern city. This street is called Pozi Street, there is not a single shop, and the people who come and go are wearing coarse linen clothes and their faces are dirty.

The people on the street looked at Xu Xiang, an uninvited guest, and their eyes were full of indifference. In their eyes, this aristocratic son in brocade clothes is out of place here.

Unlike ordinary streets, the streets are not paved with gravel, dark mud, and there is a pungent smell in the air.

"Old Yang, what does this smell like?" Xu Xiang covered his nose and asked with a frown.

"Your Highness, this is the smell of sheep dung. It is said that the houses on this street belong to a man named Hu Er, who raised many sheep and the whole road was covered with sheep dung. He didn't send anyone to clean it up, and over time, the stench became even stronger. The people who live here are used to it. Why don't you go back first? ”

"It's okay, let's go."

Soon, they stopped in front of a dilapidated room, which, unlike the other filthy ones, was cleaned, and in some places even had a layer of stones.

Yang Dianfeng knocked on the door, and the voice of an immature little girl came from inside: "Who! ”

"Is it Qianqian? I'm your Uncle Yang. "Before Yang Dianfeng went outside the city to meet Xu Xiang, he lived here, so he was already familiar with this family.

The door creaked open, and a small head protruded from inside, which was the little girl I had seen in line to receive porridge before.

Now, however, she was dressed in a clean cloth garment, a little different from the dirty, patched linen girl she had worn before, her whole face had been cleaned, and she had two pigtails and a small bell pinned to them.

When she raised her head to look at Xu Xiang, the bells jingled.

"Uncle Yang!" A sweet smile appeared on Qianqian's face, and she knelt down again solemnly when she saw Xu Xiang, "Qianqian has seen His Royal Highness the Second Prince!" ”

Xu Xiang smiled slightly, gently helped her up, touched her little head, and said, "Qianqian, you don't need to salute when you see your brother in the future, understand?" ”

"But my mother said that you are Your Highness, you must know etiquette, and be humble and humble!" She raised her head high, looked at Xu Xiang with a pair of watery eyes, and said seriously.

"It's okay, my brother will tell your father and mother, you will call me Brother Xu in the future, okay?"

"Okay."

"Well, Qianqian is so good! Is your mom and dad here? Xu Xiang held her in his arms and asked.

"My mother went out to set up a stall, and my father is at home."

"Stalls?" Xu Xiang turned his head to look at Yang Dianfeng.

"Oh, that's right, Your Highness! Didn't the subordinates give them some silver taels for their family? But considering that it would not last long to rely on these silver taels, he helped set up a baked cake stall so that they could maintain their lives. Yang Dianfeng explained.

"Hmm." Xu Xiang nodded, Yang Dianfeng's angle of thinking about the problem is still good.

"Let's go, let's go see your dad first."

Walking into the room, a strong smell of medicine filled the whole room, the room was slightly dark, and there was a straw mat bed in the corner, on which lay a middle-aged man with a scruffy beard, his eyes closed, making an even breathing sound, presumably asleep.

Xu Xiang put Qianqian down, and the little girl whispered: "Brother Xu, half an hour ago, my father drank the medicine and fell asleep. Wait a minute, I'll wake up Daddy. ”

"No need." Xu Xiang waved his hand, since he was asleep, there was no need to wake him up, he was idle and had nothing to do.

Hearing some movement, the middle-aged man on the bed woke up leisurely.

"Your Highness, Lu Tianyao has woken up." Yang Dianfeng noticed it and said to Xu Xiang.

"Brother Yang, Brother Xu!" Lu Tianyao woke up and found Yang Dianfeng and Xu Yi, so he said hello, but when he saw Xu Xiang but didn't know him, he asked, "Who is this?" ”

"Daddy, daddy, this is our great benefactor, His Royal Highness the Second Prince of the Chu State!" Qianqian ran to the side of the bed and helped Lu Tianyao sit up.

After Lu Tianyao heard this, he panicked and was about to get out of bed, but he struggled, even with Qianqian's help, he failed.

"The villain Lu Tianyao has seen His Highness, the place of picklement, how can he let His Highness come? The villain is terrified! He lay on the bed, looking very distracted.

"Brother Lu, don't be polite, Your Highness is very easy-going, you can lie down and recuperate!" Yang Dianfeng walked to the side of the bed, helped him up, and motioned for him to lie down.

"The villain doesn't dare!" Lu Tianyao was still sincerely frightened, lying his head on the edge of the bed.

"Lu Tianyao, you get up first, it's important to have a good life and recuperate." Xu Xiang said.

"Your Highness!" Only then did Lu Tianyao raise his head and lie on his side.

"Lao Yang, what kind of disease does he have? Isn't it curable? Xu Cheng brought a wooden chair, and after Xu Xiang sat down, he asked.

"Your Highness, Brother Lu, he is not sick, but he has been poisoned by the oligostone water, and it is a great luck to be able to survive, and the possibility of healing is very small." Yang Dianfeng replied.

"What is the poison of the oligostone water?" Xu Xiang frowned, this was the first time he had heard of this water, so naturally he didn't understand.

"In the border of the Western Wei Dynasty, there is a high mountain, which is said to have been exposed to a black stone river under the fire thousands of years ago. Later, the Stone River solidified and formed a mountain range, which was called the Oligostone Mountain. ”

"Skyfire? Isn't it a volcanic eruption? Xu Xiang thought to himself.

Yang Dianfeng continued, "A thousand years ago, the locals extracted a kind of oil from the Oligostone Mountain, and thought it could replace vegetable oil, but they didn't expect that the people who ate this oil would die not long after. At that time, there were tens of thousands of people in the border city, but few survived, and it became a dead city! ”

"After the Xuanyuan clan ruled the world, they forbade people to collect this oil, and sealed the mountain road with huge stones! But it didn't take long for a cult to appear in a small city near the borderlands, and they seemed to have mastered the properties of this oil and made it into a poison, called oligostone water, which could achieve the effect of controlling people! ”

At that time, General Ling Chen, the ancestor of the Western Wei Dynasty, annihilated this cult and held this oil in his hands. After so many years, everyone thought that the widow stone water had disappeared, but they didn't expect it to appear in Brother Lu now! ”

Xu Xiang frowned, the mountain formed by the volcanic eruption must contain many minerals! Isn't the oil extracted from the mine mineral oil?

This oligostone water is mineral oil, is Lu Tianyao poisoned by mineral oil?

Mineral oil is one of the important raw materials for the manufacture of laundry detergents and detergents. If mineral oil is ingested, it will affect the body's absorption of vitamins, especially vitamin C.

Could it be that Lu Tianyao's disease is a lack of vitamin C?

He looked at Lu Tianyao, and then asked, "Lu Tianyao, you lift the quilt and let me see your skin." ”

Lu Tianyao was a little puzzled, but he still did it.

"Sure enough!" Xu Xiang saw that he was already skinny, with purple spots on his skin in many places, and a trace of black blood on his skin.

"Open your mouth, I'll see!" To confirm his conjecture, he added.

"Your Highness? You ......" Lu Tianyao hesitated, he was already very ashamed to let a prince come to the shabby place where he lived. There is a foul smell in his mouth, and if he opens his mouth to let His Royal Highness see it, and smokes His Highness, he will die in vain.

"Open your mouth!" Xu Xiang insisted.

In desperation, he had to open his mouth, Xu Xiang saw that his gums were also bleeding, and the guess in his heart was already eight or nine.

These symptoms are none other than vitamin C deficiency, commonly known as scurvy, which is caused by a lack of vitamin C.

"Okay, how did you get poisoned, tell me about it." Since it is scurvy, it is not a very big disease, in the context of the very poor medical environment in ancient times, it is difficult to prescribe the right medicine, but for Xu Xiang, it is insignificant.