Xin Yi was woken up by a series of firecrackers.

The artillery of this era was no worse than that of later generations. The sound came in the quiet early morning, shocking half of the sky.

Xin Yi opened the tent uneasily.

"Apricot round."

Xingyuan put on her clothes and came over, "Madam, why are you awake?"

Xin Yi pressed his forehead, "Didn't you hear the sound of the firecrackers?"

Xingyuan pricked up her ears and listened for a moment, "I heard it now, it seemed like it was coming from the other side of Yu Street..."

Perhaps due to the innate advantages of time travel, Xinyi is better than ordinary people in terms of strength, sense of smell and hearing, but Xingyuan is not that sensitive.

"Did Yinshuang fly back?"

Xingyuan shook her head.

"This trip will take a lot of time, and there are boats on the river. Yinshuang must have spent some time to find the prince."

Xin Yi smiled and said, "You think Yinshuang looks like you."

Xingyuan smiled sheepishly, "Then let me go take a look..."

Yinshuang's cage is placed by the window of the penthouse. It is empty. Where is the bird?

Xin Yi sat up from the bed, his unwashed little face full of worry, "No, I can't just sit in the capital and wait..."

It was extremely cold at night. Xingyuan saw that she was wearing thin clothes and was afraid that she would catch cold, so she quickly pulled up the quilt and wrapped her around her body.

"Then what are you going to do? Is it possible..."

Before her voice fell, Xin Yi had already answered, "Go to Yangzhou."

"Ah." Xingyuan has always been a calm-tempered person, and she was so shocked that she was speechless.

"If the princess goes to this time, I'm afraid it won't be easy for the eldest princess to explain, and it won't be safe without the escort of the princess..."

"If it's hard to explain, then find a way. Can a living person suffocate to death?" Xin Yi opened the quilt and sat on the edge of the bed. She found that her body had sunk a lot, and she subconsciously stroked her lower abdomen and said:

"I'm not going to sleep anymore. Please change my clothes for me. I have to get up and take a shower."

Xing Yuan was very anxious, "It's not yet dawn, what are you trying to do..."

Xin Yi seemed not to hear, looking down at his feet, his thoughts drifting away.

After a while, she sat in front of the desk, Xingyuan held the fire cage next to her, yawned and polished her ink.

Xin Yi glanced at her and said, "Go down and sleep."

"Oh." Xingyuan knew that her master wanted to write something at this time and didn't want her to wait around, so she walked away.

Xin Yi buried his head at his desk, writing and drawing on paper under the dim light.

Today is the twenty-eighth day of the first lunar month of the second year of Zhihe. It has been ten days since Master Qingyu Yu Du first came to the medicine shop to consult her.

The reasons that prompted Xin Yi to write that letter to Fu Jiuqu were Prince Qingyu's illness and his coming from Yangzhou, which reminded him of a side quest in "Bianjing Fu".

——Yangzhou strange disease.

Mr. Qingyu suffered from exactly that kind of disease.

The condition comes from the setting of the traditional Chinese medicine team. It is similar to typhoid fever and the treatment is not complicated.

The first time he was given the prescription, Xin Yi used the originally set treatment plan, which was the same as the one given to Fu Jiuqu. It was said that Mr. Qingyu would get significantly better after taking it.

However, three days later, Mr. Qingyu came to the door again, still coughing badly.

Not only that, he was also accompanied by symptoms such as nausea and vomiting, lethargy, diarrhea, and blood in the stool, and his condition clearly worsened.

This is equivalent to a problem that was cured by Xin Yi's hand.

Xin Yi did not prescribe medicine this time, but asked him to bring the prescriptions and medicine residues he had taken before. Unfortunately, there was no abnormality in the prescriptions. It was a normal prescription for typhoid fever, which was basically symptomatic.

But he could no longer find the used dregs of medicine.

Xin Yi consulted again and found that he had kidney damage and suspected that he had been poisoned.

However, Mr. Qingyu believed that he had no enemies, let alone made enemies with anyone, and his diet was ordinary. He could not think of the possibility of poisoning. At the moment, Xin Yi had no way to do a toxicity test for him.

Seeing that his health was deteriorating, Xin Yi had no choice but to admit him to the ward of the medicine shop, ordered two clerks to take care of him, and asked Ge Huan to observe him at any time.

After nearly seven days of treatment, Mr. Qingyu's health improved significantly.

But Xin Yi still couldn't sleep.

She felt that there must be something wrong with this...

From Master Qingyu's "Song of the Cave Immortal" to the mysterious illness with no clue, she developed an unfounded but firm sixth sense that there must be some kind of connection between these things.

It is a line that is in the plot, but also outside the plot, and is unknown to her and Fu Jiuqu. She even thinks it may be related to the deleted treasure hidden by the empress of the Southern Tang Dynasty that Fu Jiuqu said.

She wrote to ask Fu Jiuqu for his opinion. After all, he was the one who had read the original version. However, Yin Shuang was gone forever. In addition to worrying about the changes in things, she also had to worry about Yin Shuang's safety.

The lights flickered slightly.

Xin Yi came back to his senses and looked at the clues written on the paper.

Song of the Cave Immortal—Treasures of the Southern Tang Dynasty—Strange Diseases of Yangzhou—Prince of Pingyuan County—Black Gunpowder Workshop—Sapphire Young Master—

The events and characters she connected with each other were magnified little by little in front of her eyes.

Suddenly, an idea flashed in her mind.

"Aristolochia."

Aristolochia is a traditional Chinese medicine.

Relieves cough and asthma, suitable for cough, chest tightness, yellow phlegm and lung abscess...

At the same time, Aristolochia contains aristolochic acid, which has obvious nephrotoxic and carcinogenic effects. It can cause symptoms such as diarrhea and bloody stools, and has fatal effects on patients with poor kidney function. The symptoms of poisoning are very similar to those of Qingyu Gongzi.

But this is not what Xin Yi is concerned about...

She picked up the pen and drew a circle on "Black Powder Workshop".

Aristolochia is a traditional Chinese medicine, and it is also a medicine that can start fire. When burned, it becomes charcoal, which can be used to make black gunpowder. Initially, gunpowder was discovered and used by humans in elixir training, and Aristolochia can be found there.

"Two liang of sulfur, two liang of saltpeter, three and a half qian of Aristolochia..."

Xin Yi inexplicably thought of the process of the invention of black gunpowder, and his mind was buzzing.

"To make black powder, wouldn't it be more convenient to use charcoal?"

When it was daylight, a thin layer of sweat was already forming on her back.

Xingyuan knocked on the door and came in. When she saw her face was red, she was startled and asked, "What's wrong, madam?"

Xin Yi casually tore up the white paper he had written on, threw it into the fire cage, watched the flames licking up, and loosened the ties of his fur cloak.

"The fire cage was placed too close and almost cooked me."

Xingyuan snorted, smiled and stepped forward to wipe her sweat.

"Madam, Yinshuang is back."

Xin Yi was startled, how could he still sit still?

She brushed Xingyuan's hand away, opened the door in three steps and then went out in two steps.

When the cold wind blew, she sneezed, and the bird that was pecking on the window sill heard the sound and flapped its wings and flew towards her.

This bird is very understanding of human nature.

As soon as Xinyi stretched out her arm, it stopped on it and pecked her affectionately.

"You scared me to death." Xin Yi grabbed Yin Shuang and subconsciously went to get the letter on her anklet.

A small piece of paper was rolled into a tube, with four simple words.

"Thanks for letting me know."

That’s it?

In addition to the prescription, she also specifically explained Mr. Qingyu’s consultation and her doubts. Why did this person seem to not understand?

Xin Yi took a breath and felt coldness from his nose to his mouth.

Alas! After all, he is not the ninth brother, so he lacks a tacit understanding with her.

"Madam, what did the prince say?" Xingyuan looked at her back and asked in a low voice.

Xin Yi rolled the note into his sleeve and said, "Take good care of Yinshuang and wait until I come back from the pharmacy."

··

The wind is cold and the water is cold. The temperature has dropped today, and Bianjing is feeling chilly.

After seeing today's tabloid in the medicine shop, Xin Yi knew the reason for the firecrackers in the early morning.

Yan Shu, the great scholar of Guanwen Palace and Minister of War, is gone.

This famous politician and writer who entered the examination as a child prodigy, once ruled the world, and had a profound influence on the Northern Song Dynasty court died this winter.
To be continued...