"Did this man drown in the water before he died, or was he thrown into the water after he died?"

"The preliminary judgment is that he drowned in the water before his death." Yang Qiuchi picked up the corpse's hand and motioned for Song Yun'er to look at the nails of the deceased's fingers. Song Yun'er stared at it for a long time, didn't find anything abnormal, and looked at Yang Qiuchi suspiciously.

Yang Qiuchi said: "You pay attention to what is in his fingernails? ”

Song Yun'er stared at the fingernail slit, frowned and said, "Huh~!" This man's nails don't cut or cut, look at the black mud in this nail~! ”

"Take a good look, it's not black mud."

"Not? What is that? ”

"River mud, mud and sand at the bottom of the river!"

Song Yun'er's eyes lit up: "I know, if this person enters the water alive, because he is tied to the stone, he will sink to the bottom of the water, and the mud and sand will not be deposited into the nails with the current, but only when he struggles, he will only be left behind by grabbing and digging the sediment at the bottom of the river." ”

"Good!" Yang Qiuchi praised, "Yun'er has learned to observe carefully, and this kind of careful observation is needed to solve cases, and only in this way can we find clues to the crime." ”

Song Yun'er smiled proudly, revealing neat little teeth. Yang Qiuchi found that Song Yun'er's little teeth were as neat and beautiful as her cousin Song Qing's.

Yang Qiuchi continued: "Based on the crab-like foam on the deceased's nose and mouth and the mud and sand in his fingernails, the preliminary judgment is that he entered the water before his death. ”

"How do you test it further?" Song Yun'er said curiously.

"This ...... It's too complicated, I'll tell you later. Yang Qiuchi played a trick and then continued to examine the body.

It's not that he sells off, but he really can't tell Song Yun'er, because further testing is to conduct an autopsy, and after the autopsy, if foreign bodies such as inhaled river water or even aquatic plants are found in the upper respiratory tract of the deceased, or mucosal epithelial swelling caused by violent coughing in the respiratory tract, as well as emphysema surnamed Shui, or river water or even aquatic weeds and sediment foreign bodies are found in the stomach, it can be further judged to be drowning.

Because only the act of breathing in a living person can cause this result, and the dead person does not breathe, the water can only reach the mouth, at most the upper part of the upper respiratory tract, and cannot reach the lungs or the stomach and intestines.

In addition, the autopsy also has a very important task, which is to detect the diatoms in the body of the deceased, if plankton diatoms are found in the internal organs of the deceased, it is almost certain that they drowned before death.

Of course, autopsies could not be performed in ancient times. Yang Qiuchi wasn't ready to take this risk, so he couldn't talk to Song Yun'er.

However, although an autopsy cannot be performed, the necessary laboratory tests must be done. One of the most important tests in a drowning autopsy must be done by Yang Qiuchi is to test for diatoms. This is an important reference for finding the place where the deceased fell into the water.

Diatoms are plankton that are invisible to the human eye in waters, mostly single-celled, that can be sucked into the lungs by the deceased by the current and circulated throughout the body. If a person is thrown into the water after death, the diatoms in the water cannot enter the human body because the dead person cannot breathe. Therefore, the discovery of diatoms in the internal organs of the human body can be used as important evidence to prove that he drowned in the water before his death.

Of course, this is not absolute, and there are cases where diatoms are detected in the body even though they have not drowned, because diatoms are not only found in water, but also in moist places on land, in the air, and in food.

Another important role of diatom testing is to find the location of the deceased who fell into the water.

There are about 15,000 types of diatoms, and in a river, the types and units of diatoms in different waters cannot be exactly the same. What Yang Qiuchi has to do is to find out the diatoms in the deceased's body and determine their species and unit quantity, and then take water samples from different sections of the water in the water and upstream for testing, and find that the two are consistent, and that is the place where the water falls.

The content of diatoms in various organs and tissues in the human body is different, mainly concentrated in the lungs and liver, and other heart, kidney, heart, and spleen. However, the detection rate varies greatly depending on the amount of internal organs. For example, it can be detected 100% in the lungs, but in the spleen, only 14% of the possible surnames are detected.

Therefore, it is ideal to dissect and extract the lungs and livers for testing, but this was not possible in ancient times, but this is difficult for Yang Qiuchi, because diatoms can also be found in the teeth of the drowned.

So, Yang Qiuchi extracted a deceased's tooth for examination.

Song Yun'er saw that Yang Qiuchi refused to speak, so she pursed her lips, and then watched Yang Qiuchi inspect the body.

Yang Qiuchi examined the cornea of the deceased and found that it had been severely clouded, and the epidermis of the skin of the hands and feet had fallen off.

When the mortis was examined, it was found that the morture had begun to resolve. It was judged that the time of death of the deceased was about two days, and the mortis of the corpse on land generally began to ease after three days. However, it is different for people who drown, because of the violent struggle, convulsions, and strenuous movement of the muscles, the mortis occurs early, and correspondingly, the relief is relatively early.

Examination of the body surface of the corpse found that there were some scratch marks, very shallow, not enough to cause death, it should be caused by the collision of the corpse with rocks and other things when it was floating in the water, in addition, there were some small white wounds on the corpse, which were left by the bite of small fish or something.

There was a thin iron chain around the neck of the deceased, and a large stone was tied to one end of the chain. Yang Qiuchi carefully examined the neck of the deceased.

Song Yun'er leaned over to take a look and asked, "Brother, did you find anything?" ”

Yang Qiuchi touched his chin and thought about it, and said: "Although the neck of the deceased has traces of subcutaneous bleeding left by the friction of this iron chain, there are no traces of strangulation, and the iron chain is set on the neck, not the neck, so those friction marks should be left by the friction of the iron chain when the deceased struggled, not the cause of death." ”

"There are no obvious signs of trauma on the surface of this deceased, could it be that he was tied up and stoned and thrown into the water and drowned alive? Or suicide? Song Yun'er touched her chin and groaned as she learned from Yang Qiuchi's appearance, looking very sophisticated.

"We can't draw this kind of conclusion yet, because at least there is still a place on the body surface of the body that has not been examined, so let's check it first." Yang Qiuchi carefully looked at the deceased's hair, and suddenly, his hand stopped, "The deceased has a scalp laceration on his head!" ”

"I'll see!" Song Yun'er leaned over to take a look, and sure enough, the scalp of the deceased's head was cracked an inch long, and Bai Sensen's skull could be seen when the crack was separated.

Yang Qiuchi first measured the size of the wound, and then carefully distinguished the shape of the wound, and couldn't help but sigh.

"What's wrong?" Song Yun'er stared at the wound, looking left and right to see that she didn't understand.

Yang Qiuchi looked at Song Yun'er and said, "Yun'er, you've been with me for so long, and I've also taught you how to identify wounds. ”

Song Yun'er put her head on the back of the deceased's head, looked at it for a long time, and said, "It doesn't look like a knife." ”

Yang Qiuchi nodded approvingly: "Why?" ”

"You said before that the wound wall of a sharp wound is smooth, and there is no bridge between tissues in the wound cavity, so the wound wall is not very smooth." Song Yun'er has a good memory, she has memorized all these forensic proper nouns that Yang Qiuchi said before, and she also knows how to use them.

"Very good," Yang Qiuchi praised, "This wound is indeed not cut with a sharp weapon." ”

"What did you cut it for?"

Yang Qiuchi used a scalpel to cut the scalp of the incision twice, exposing the wound, wiped the skull under the wound with a sweat towel, and said: "Pay attention, there is a thin fracture line here, and there are no scratch marks on both sides of the fracture line." Since the hardness of the human skull is about the same as that of copper, since the murder weapon did not leave scratches on the skull, it means that the hardness of the murder weapon is softer than that of copper, and it is likely that it was a wooden stick or something. ”

"Sticks? Can a wooden stick cut a wound too? ”

"Ordinary wooden sticks are blunt objects, and it is difficult to form such wounds, so this wooden stick should be diamond-shaped."

"Oh," Song Yun'er understood, and asked again, "Then was this person killed by this diamond-shaped wooden stick?" Then he thought that Yang Qiuchi had just said that this person had drowned in the water before his death, how could he have been killed by a wooden stick, so he quickly changed his words: "No, it should be said that after being knocked unconscious by a wooden stick, he tied a stone and sank into the water and drowned." Right? ”

"Well, the blow of the murderer's wooden stick only caused a fracture of the deceased's skull, which can cause trauma such as concussion or intracranial hemorrhage, but judging from the blow, it is unlikely to cause the victim to die on the spot. According to the autopsy just now, the deceased was drowned, indicating that the victim was still alive after being hit by this stick and before being sunk into the water. ”

"Did you find the clue to the murderer?"

Yang Qiuchi smiled bitterly: "You are always in such a hurry, and I am not an immortal, how can I know who the murderer is at once." However, I already have a direction to detect. ”

"Really? In what direction? Song Yun'er asked urgently.

Yang Qiuchi walked to the Ba River, observed the flow of the river for a while, and said: "Although the iron chain tied around the neck of the deceased is bound with stones, this stone is not too heavy, and the water flow of the Ba River is relatively turbulent, which should be able to flush the body down, so the place where the water fell is likely to be somewhere upstream, but not too far." ”

He then ordered the captors to go up the banks of the river and search carefully for any traces of blood or fighting, and to bring back some water from here and within ten miles of the river at intervals in bottles, marking where it was extracted.

The catchers are commanded and gone!

(To be continued)