In the ingredient room, Xu Ming tested the five new barrels of mountain spring water received in the morning one by one.

"All this is the water you received today?"

Carefully looking at the test results of the five buckets of water, Xu Ming frowned.

"Yes, except for two buckets of water to feed the chickens in the morning, there are five buckets left. ”

Yu Dabao replied truthfully.

"Professor Xu, can you see that there is something wrong?"

Yu Tingwei was nervous, she didn't suspect the problem of drinking water before, but the conditions in the chicken farm were limited, and the composition of drinking water could not be tested, plus they themselves drank the water from the mountain, and they didn't find any problems, so they didn't care too much.

"Which of these five buckets of water was the first to be connected, can you still remember?"

Xu Ming was immersed in his own thoughts and did not answer Yu Tingwei's question.

"Of course you can," Yu Dabao said firmly: "Start from the left and line up in turn." ”

The order of the barrels is fixed, every day is to take one bucket and put it back in its original place, and then replace the next bucket, this Yu Dabao can't be wrong.

"Well......" Xu Ming nodded, and then asked: "Now please ask Director Yu to take us to the birthplace of the mountain spring again." ”

"Okay, please come with me. ”

Yu Tingwei didn't say a word, and immediately led the way and led Xu Ming and the others up the mountain.

Although Xu Ming didn't say anything now, Yu Tingwei could see that Xu Ming must have discovered something.

"It's really urgent," Yu Dabao also followed a group of people to the back and muttered, "Is this expert good or not, like a stuffy gourd, he can only ask, and he can't say one, two, three, four." ”

"Quiet, what's the hurry? Aren't you investigating the reason!"

Liu Qing tugged at the corner of Yu Dabao's clothes and blamed him for not being able to bear it.

A few people walked along the mountain road that was not too steep all the way in the direction of the mountain spring.

"Strangely, this path seems to be often walked. ”

Yu Tingwei walked in the front, looking at the weeds on the path with obvious traces of being stepped on repeatedly, and her heart became more and more suspicious.

"Every house in the village has a well, so it's not too much trouble for anyone to come here to fetch water. ”

Yu Dabao walked at the end, and said casually when he heard Yu Tingwei's words.

Because he walked behind, he walked on the road that the people in front of him had trodden, so Yu Dabao didn't care too much about the path under his feet.

It's just that the speaker has no intention, but the listener has a heart. Yu Tingwei was observing all the way, it is true that this road does not lead to the tomb, who has nothing to do here?

After walking for about half an hour, we arrived at the source of the spring.

"Professor Xu, you see, the water flows out of the cracks between the rocks above, and then merges into a small stream and flows into a small river at the foot of the mountain. ”

"I think it's been a lot of people coming here lately. ”

Xu Ming judged as he looked at the chaotic footprints around him.

"It should be. ”

Yu Tingwei also found these footprints, Yu Tingwei paid attention all the way, and when she arrived at this mountain spring, these footprints were even more conspicuous when she stepped on the damp soil.

Xu Ming and several experts squatted next to the spring to take samples and then test them on the spot. Yu Tingwei and Yu Dabao were nearby to check.

Yu Tingwei now also supports Xu Ming's statement that someone poisoned the water.

"Professor Xu, what do you think this is?"

Yu Tingwei had just taken a few steps downstream of the spring, and at a glance, she saw white powder sprinkled on the rocky beach by the edge of the water.

Xu Ming rushed over when he heard the sound, wiped a little between his fingers with his fingertips, and put it in front of his nose and sniffed, "That's right, this is sodium chloride!"

At this time, the researchers who went up the mountain with Xu Ming also did a preliminary test on the mountain spring, and it can be judged that the water quality is non-toxic and harmless.

Xu Ming reaffirmed his inference, "My guess is right, this water is not poisonous, someone must have poisoned this water." Of the five buckets of water tested before, the first and second buckets obviously contained a large amount of potassium chloride, which was gradually diluted in the third bucket, and by the time the fifth bucket of water was reached, the toxic water had already flowed through and was almost undetectable. ”

"In other words, someone poisoned the water source at the same time as we were getting water for the chickens in the morning. ”

Yu Tingwei continued Xu Ming's words.

"Yes, the poisonous part of the water happened to be taken back by you and fed to the chickens, which caused a large number of poisoning deaths of the chickens. ”

"So what the hell is this potassium chloride, and why is it poisonous?"

Yu Dabao scratched the back of his head, and asked weakly, no way, there is less reading.

"Potassium chloride is a chemical agent, similar to the refined salt we consume, which is highly soluble in water, and can be poisoned when taken in large amounts, causing cardiac arrest and sudden death. ”

Xu Ming briefly popularized the dangers of potassium chloride.

"Oh my God! it's terrible!" Liu Qing's hair stood on end when he heard this, "Who is this? Why do you do this?"

"It's just that it's good that we don't use our own water to feed the chickens, otherwise we would have to die. ”

Yu Dabao said with palpitations.

“...... Professor Xu, you see, now that the cause has been found, is there any possibility that these poisoned chickens will be cured?"

Now is not the time to discuss who poisoned, Yu Tingwei is now thinking about how to maximize the recovery and minimize the loss.

"Of course, now we'll go back to the right medicine. ”

"That's good! There's Professor Lao Xu. ”

Now that the reason has been found, after a group of people descended the mountain, Xu Ming and his team of experts immediately devoted themselves to the treatment of sick chickens.

And Yu Tingwei was not idle here, on the premise of fully assisting Xu Ming, Yu Tingwei readjusted the use of drinking water.

Every day, Yu Dabao led the workers of the chicken farm to fetch water at the source of the spring, and also sent people to hide in the water source before dawn and squatted to catch the poisoners.

Three days have passed in a blink of an eye, and under Xu Ming's careful treatment, the terminally ill chickens in the chicken farm have basically come back to life, and there are no new sick and dead chickens.

The strange thing is that Yu Tingwei sent to catch the poisoners squatted on the mountain for three days in a row and did not find any suspicious characters, except for Yu Dabao and a few of them who came up to fetch water.

Moreover, the water flowing down the mountain Xu Ming will have people take samples and test them at different times every day, and no more problems with the water quality will be found.

This poisoning incident is as if everyone made it up out of thin air, and there is no follow-up.

Under the careful care of Xu Ming and others, the chickens in the chicken farm jumped up and down again, calculating the losses, a total of more than 4,000 chickens died, and she Yu Tingwei also paid for this loss.

It's just that what makes Yu Tingwei haunted is the hateful poisoner, and if she doesn't catch this person for a day, Yu Tingwei won't be able to let go of her feelings for a day.

Now that the chickens are all fine, Xu Ming has taught Yu Tingwei some experience and techniques in raising chickens, and tomorrow Xu Ming and his party will be ready to go home.

In the afternoon, Yu Tingwei accompanied Xu Ming to the back cliff of the northern slope.

"This is where Mu Xiujin and I first met. ”

Yu Tingwei climbed on the flat big rock that she always likes to sleep on, and said with emotion.

Last year, at this time, she came here from the 21st century, and on the first day, she met Mu Xiujin, who was hunted down.