By asking for directions, they came to the town's Northern Mongolian Garrison Division.

This place was at the easternmost end of the town, and there were far fewer people here than they had just seen when they entered the town.

From a distance, I saw a group of men wearing the armor of the Northern Mongolian soldiers gambling, and there were many people around to watch the play, and even the soldiers standing guard were leaning crookedly against the door post, looking listless.

Seeing several people approaching, one of the soldiers came over and stopped them.

"Stop! What for? This is the Northern Mongolian Garrison Division, if you don't want to die, get out of the way! The soldier seemed to be in a very bad mood, and shouted at the top of his voice.

"I heard you can exchange it for a silver ticket here?" Xu Xiang asked.

"Silver ticket?" Hearing Xu Xiang's words, the soldier's eyes lit up, his face changed, and he asked kindly, "How much do you want to exchange?" ”

In fact, this Mongolian silver ticket was not made by Mu Shang, but by the commander of the Northern Mongolian garrison here.

The reason why he wanted to do this was because he wanted to make some money, after all, now that he had lost the supplies from Beimeng, he could only find a way by himself.

It was forbidden to use the Great Xia silver ticket, and the use of this Mongolian silver ticket was made up by the garrison commander after Chinese New Year's Eve, and he never thought that this matter would have any impact on Northern Mongolia.

He only knew that one hundred taels of Daxia silver tickets could only be exchanged for seventy taels of Mongolian silver tickets, and the exchange ratio of Mongolian silver tickets to silver was one to one.

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In other words, as long as someone comes to exchange it, they will come to send money.

After all, Mu Shang planned to rule Chu for a long time, and he did not allow them to directly rob the people's money.

"Five hundred taels!" Xu Xiang said.

"Oh!" The soldier took out a stack of silver tickets from his bosom, dipped his thumb in saliva, and counted them.

After counting, he snatched the five hundred taels of silver tickets in Xu Xiang's hand and handed over the silver tickets in his hand.

Xu Xiang took the silver tickets in disgust, these silver tickets were no different from the silver tickets of Great Xia, except that there was a red stamp in the center, and under a red circle, a Mongolian character was written.

"It's only three hundred and fifty taels here, and what about the rest?" Xu Xiang counted the stack of silver tickets, all ten taels, and asked.

The soldier sneered and said, "Five hundred taels will only be exchanged for three hundred and fifty taels!" You don't even know this rule, so what else do you change? ”

He really doesn't know this!

Thirty percent is drawn, isn't that too dark? Good guy, he doesn't have any money to exchange in business, so he is naturally not happy!

"There is not much difference between your silver ticket and the Great Xia silver ticket at all, if you charge a few taels of silver, it's okay, it's too much to collect so much at once, right? I don't change it! He raised his own doubts and did not want to exchange with him.

The soldier looked at him fiercely, pulled out the knife directly, and threatened: "Get out! ”

The other soldiers around also stopped what they were doing, and walked over with large knives in their hands, and their faces were not good.

"Okay, okay! I'll go! "Heroes don't suffer immediate losses, if they want to fight with these Northern Mongolian soldiers, they are not qualified enough, so they can only retreat.

It was only after a few men had retreated that the soldiers put away their knives.

One of the soldiers said to the soldier who had exchanged the silver ticket for Xu Xiang just now: "Okay, Brother Jiu, I got one hundred and fifty taels in one go!" ”

The soldier waved the silver ticket in his hand, and a thick smile appeared on his face, "Brothers, tonight I will invite everyone to play together!" ”

"Nine brothers are mighty!" All the soldiers shouted happily.

Xu Xiang and the others listened to the cheers behind them and knew that they had been trapped! But there is no way, now except for the relatively far south of the city, the cities around Changhe Town are under the control of Beimeng, if these silver, attract the army of Beimeng, it will be a little more than worth the loss!

Several people finally lived in the Changhe Inn, Xu Shaoling and Lu Tianyao, the three of them each room, a total of four rooms.

The purpose of this trip is to find Baige Island on the Nanjiang River, not to play. After the luggage was placed, Xu Xiang came to Xuanyuanding's room to discuss his next actions with him.

This time, they checked a lot of information, and according to Xu Xiang's guess, this Baige Island is located in the center of the Nanjiang River, and nine hundred years have passed, without a trace, there are only two possibilities.

Either the island sank, or it was hidden with a formation, so outsiders couldn't see it.

Of these two possibilities, he prefers the second one, because over the years, although the water level of the Nanjiang River has risen, the height of its rise is not enough to flood such a large island as Baige Island.

As for the rumors, Baige Island was devoured by a giant dragon, which should be a means for the Changsun clan to release to confuse the world.

Of course, there is also the very small possibility that the earth's crust moved, causing the island to sink.

The year when Baige Island disappeared was the year when the Great Xia Dragon Sparrow Order disappeared, so there must be a certain connection between this. He never believed in gratuitous coincidences.

It took them a lot of effort to get the map around Changhe Town and Nanjiang in Shiyan City, since the reason for the disappearance of Baige Island was characterized as a formation, then they had to find clues from the map.

Regarding the formation, both of them were black-eyed. When Xu Xiang followed the archaeological team to Lop Nur before, he only roughly knew about the bending bow and the sun-by-day formation, and he couldn't do anything about the other formations.

"Your Majesty, you can't see anything from the map alone, and hiding a big island like Baige Island must not be a simple formation! I know too little about formations, do you know, Your Majesty? ”

Xuanyuan Ding shook his head, "I don't know much about the formation, I only know the formation of the world, and its origin and the method of breaking the formation are nothing more than four directions. ”

"The first is the three-source array composed of heaven, terrain, and human potential, the second is the five-element array composed of metal, wood, water, fire, and earth, the third is the seven-star array composed of Tianshu, Tianxuan, Tianji, Tianquan, Yuheng, Kaiyang, and Shaoguang, and the fourth is the eight-square array composed of gossip."

Xu Xiang frowned, these things that Xuanyuan Ding talked about were all basic things about formations, like the curved bow and sun-by-day formation he had seen before was the source formation laid by using the terrain, and as for other formations, he had never heard of them.

At this moment, there was a knock on the door, and Zhai Ling'er's voice outside the house sounded: "Your Majesty, are you resting?" ”

"It's Ling'er! Come on in! "Xuanyuan is also at a loss.

Zhai Ling'er pushed the door in, and saw that Xu Xiang was still in the house, and hurriedly owed, "Young Master Xu, you are also here!" ”

"Hmm!" Xu Xiang nodded softly in response, and then continued to look at this diagram, hoping that he could blind up something.

"Ling'er, do you have anything to do? Xu Gongzi and I are discussing the next thing! ”

"Your Majesty, Xu Gongzi, I just ordered Xiao Er to prepare some food, you see if you want to go out to eat, or send it to you!" Zhai Ling'er replied that along the way, the meals were all arranged by her.

"Well, you let them send it! After a day's journey, I was tired, so I didn't go out. Xuanyuan replied.

"Okay! Then Ling'er will arrange it! Zhai Ling'er responded.

was just about to go out, but he saw Xu Xiang scratching his head and staring at the picture on the table, which seemed to be a headache.

He held a bamboo block and gestured from time to time, trying to find some clues from a mathematical point of view.

"No, neither is the isosceles triangle!" Xu Xiang threw down the bamboo block with a stupid face, looking very helpless.

"Your Majesty, what are you doing here?" Zhai Ling'er looked at the picture on the table and asked.

"We're thinking that Baige Island is very likely to be hidden by the formation, so let's see if we can find some clues through the topographic map." Xuanyuan Ding said.

Zhai Ling'er walked over, looked at the map carefully, pointed to the place marked with the dotted line, this place was the original location of Baige Island, and said: "I don't know much about the formation, but the location of Baige Island determines that it can't arrange the source array, so it's useless for you to look at the map!" ”

"Oh?" Xu Xiang showed a curious look on his face, "Why did Miss Ling'er say that Baige Island can't arrange the source array?" According to the sky, terrain, and human power, Baige Island is located in the middle of the Nanjiang River, and it is easy to arrange this formation! ”

"Nope." She shook her head, "Although Baige Island has a good natural potential, the sun and the moon shine on the Nanjiang River, and the momentum of yin and yang can make its heavenly momentum continuous, but in terms of topography, it is not close to any land, if you have to say that it is the bottom of the Nanjiang River, it can be connected with the land, which is also its biggest flaw, it can only be connected to the land by waterway, there is water and no mountains, it is difficult to become a leyline!" ”

"In other words, because of the lack of leylines, it doesn't have the source of the terrain?" Xuanyuan asked.

"What are leylines?" Xu Xiang was puzzled and asked.

Zhai Ling'er sat down and pointed to other places in the map at random, referring to some mountain ranges, and there are generally rivers near the mountains, she explained, "On land, mountains and rivers are generally accompanied by rivers, and this mountain is composed of mountain veins, and this river is naturally composed of water veins, only when the veins of mountains and rivers are connected, can the earth veins be formed!" ”

As soon as she explained this, Xu Xiang understood in seconds! It's like this continent is equivalent to a person, and the mountains are the blood vessels, and the rivers are the blood, so that the flow of blood can be formed.

The flow of blood is the topography.

As for Baige Island, it can only be equivalent to some impurities in the blood, how can it form a topography?

"Can Miss Ling'er see what kind of formation this is?" Xu Xiang asked hopefully.

"You still have to go to the location where Baige Island disappeared to find out!" She pondered for a moment and said.

"Wait!" At this time, she seemed to think of something, "Your Majesty, I am not very familiar with formations, but I know that there is a person who is very proficient in formations!" ”

"Who?" Xuanyuan asked.