Half a month later, September 14.

The turmoil brought by the sea flight has passed, and the city of Jinhai in late autumn is shrouded in an atmosphere of harvest.

At noon, Hong Fan put away the four treasures of the study and completed the final draft of the book called "A Special Method for Determining the Value of the Infinitive", and named the method "The Law of Necessity".

In this short paper, he discusses the method of determining the value of the infinitive formula by finding the derivative and then the limit of the numerator and denominator respectively under certain conditions, completes the proof and gives several generalizations.

In fact, it is the basic content of high mathematics, the "Lobida Law" proposed by Bernoulli.

This achievement was completed in 1696 in the previous life, and it matched the progress of mathematical theory in the current instrument.

After lunch, Hong Fan took out the three hundred taels of silver tickets sewn into the futon by Aunt Liu, and went out in the warm sunshine.

This is the majority of his savings, which came from the Qi Lu who was the instrument supervisor and the one hundred taels of silver from Zhu Yi in the battle of Jinhai.

In the side room, Aunt Liu saw the young master going away, so she hurriedly took a bamboo pole and made pods under the locust tree.

As in previous years, she plans to sell the fruits to support her family.

Although Hong Fan clearly said that he hoped that Aunt Liu would rest more and hand over all the cash for dozens of days to her for safekeeping, she only felt uncomfortable if she didn't do any work.

On the other side, Hong Fan's destination is the Jiaotong Hall.

He still has one-third of the stock of the combination of Tuigong Pill, Blood Incense and Chisel Tooth Jerky, which can continue to be used for two months.

However, after a period of continuous use, the effect of chisel meat on physical fitness is getting worse and worse.

Fortunately, the traffic hall sent a message yesterday, saying that the "cistanche" he had been asking for a long time had finally arrived in a batch of good goods.

The so-called "Cistanche" is a parasitic plant that parasitizes the roots of desert trees and grows by absorbing nutrients and water from the host of Axonium, and is called "desert ginseng".

In terms of medicinal properties, Cistanche nourishes kidney yang, benefits sperm and blood, can help martial artists lay a solid foundation and improve their cultivation speed, and its value is higher than that of Tuigong Pill.

However, not much of this Liangzhou specialty is consumed by locals - the high selling prices of the state capital and Shenjing make the proportion of high-quality cistanche meat exported is very high.

Because of this, as soon as Hong Fan got the news, he planned to pick up the goods the next day, so as not to have too many dreams at night.

In the afternoon, Chisha Avenue is peaceful and prosperous, and the shouting and selling sounds are connected, and only in the core areas such as the traffic hall will it be slightly restrained.

One is born, and the second is ripe; Hong Fan passed by the guards outside the door without squinting, and as soon as he crossed the threshold, he saw the familiar face of the maid greet him.

It was the original "E-Ming".

"Hong Fan Gongzi, you're here!"

E Ming directly called out her name, obviously remembering the handsome young man in front of her.

"The cistanche you want has arrived, the best quality, you can take it after you check it."

Hong Fan nodded and wanted to go inside, but was stopped by the maid in the entrance where no one was.

"Young Master Hong, the rules of the traffic hall, you have to untie the sword first."

She took a half-step closer and whispered.

Hearing this, Hong Fan glanced at the Zhaoming Street not far behind him, and without saying much, he untied the horizontal knife of "Wang Buliuxing" and handed it to the other party.

With a sigh of relief, she turned around and beckoned to another, younger waitress, who respectfully took the knife with both hands and went to the back hall.

At the counter, Hong Fan saw the goal of the trip.

On the red goose down, several catties of sun-dried cistanche are neatly arranged.

These desert ginseng are more than a meter long, with unbranched stems with bell-shaped calyxes and a large number of dense scaly-like leaves.

Overall, the appearance is not elegant.

"It's all first-hand goods collected from the surrounding areas in our church, enough for one person to use for half a year, a total of one hundred and twenty taels."

E Ming said.

"This price has already counted the discount given to you by the eldest lady."

Hong Fan nodded and carefully inspected each cistanche to make sure it was intact inside and out.

After about a cup of tea, he finally nodded and took out two hundred taels of silver tickets to pay the bill.

"I'll have someone wrap it up for you."

E Ming checked the silver ticket at will, and her expression was still meticulous.

"If you want to use Cistanche, you can cut thin slices and make tea for it, or you can make ointment in Xunlang."

She didn't rush to find the bookkeeper, and suddenly whispered again.

"Young Master Hong, regarding martial arts cultivation, we actually happen to have a better pill in our store-Huoqi Pill."

Hong Fan raised his eyebrows.

He had heard of this Huo Qi Dan - this was the product of the Meng family, the number one family in Huaiye City, another big city in Liangzhou, and its effect was far superior to that of the Tuigong Pill, and it was said that it also had a certain effect on the Chaos Realm.

"The medicinal power of the Living Qi Pill is at least five times that of the Pushing Palace Pill, and the benefit to the cultivation efficiency of the Penetrating Realm martial artist is also three or four percent higher."

Seeing that the other party was moved, E Ming introduced it more attentively.

"At present, there are two ownerless live Qi pills in the store, and one is ...... price."

"One piece is worth forty taels, after discounting."

E Ming paused and reported a number.

Needless to say, there is a high premium and commission in this price.

But Hong Fan is not Aunt Liu, as long as he can exchange money for martial arts progress within the scope of tolerance, he is as good as possible.

"I want it, you go and get it."

This sentence made E Ming breathe a sigh of relief, nodded heavily and went to the back hall.

However, it didn't take long for things to take a turn for the worse.

When E Ming walked back to the front hall with a red sandalwood box, she was stopped.

It was a tall young man, richly dressed with a sword, and looked to be about twenty-five or sixteen years of age.

And the maid who led him was the one who untied the sword for Hong Fan before.

Hong Fan leaned over and heard the other party's words before he got close.

"Buying things is first-come, first-served, these two Huoqi Pills came to me first, so naturally I deserve them!"

The young man reached out to grab the box as he spoke, but the waitress stepped back and got out of the way.

"E-Ming, what's wrong?"

At this time, Hong Fan arrived.

Following his voice, the young man stopped and turned to look, his gaze scanning over his clothes and accessories.

Just looking at the appearance, Hong Fan's clothes can only be said to be neat, far less beautiful than the wealth and exquisiteness of the other party's jade ring.

It's just that when it comes to appearance, it's just the opposite.

"I'm tired of waiting."

E Ming first owed a debt to Hong Fan, and then turned to the other party.

"Fang Shaodong, I'm really sorry, but these two pills have been set by Gongzi Hong, and now the things are also in the hands of the slave."

"If this time it's the beautiful woman who gets the things first, Eming will have nothing to say."

The "beauty" in her mouth is the name of another waitress.

"You don't want to trick me, the beauty and I made it clear that no one has booked the Living Qi Pill."

Fang Shaodong just sneered, even if he heard that the competitor's surname was Hong, he would not back down.

It must be known that the Hong family is at least dozens older than the son-in-law, and all of them have to be let go, where can they let them come?

If it is really the important ones, he will not be unrecognizable as a character on the stage.

"This living Qi Dan is of great use to this son, and I can't give it to my son."

Fang Shaodong said, stopping in front of E Ming.

The waitress was a little at a loss for a while.

"E-Ming, you relax."

At this time, Hong Fan said.

He has a general understanding of the Jin Haifang family - it is a second-tier family in the city, and it is famous for its financial resources.

The person in front of him is not surprisingly Fang Zhiwu, the head of the Fang family.

Compared with the Hong family, the Fang family has a gap in strength and strength.

It's hard to say if it was half a year ago, but with his current status in the family, there will be no follow-up if he doesn't sell face today.