Hadith 1

ause their intestines are very bitter as if they are emptied for the time, and therefore dogs do not eat them unless they are forced to starve, and like that are the horses and the mules. As for the spleen, it is a fleshy, oblong organ in the shape of the tongue, connected to the stomach from its left to the back, where the crucifixion is well-groomed, concave on the convexity of the stomach, connected to it by a vein that connects them and is tied by a large number of people with small quantities that branch from the peritoneum and connect to it and disperse in it and its tubercle following the ribs resting on its membranes because it is not related to many strong bonds, but to a few fibres. From this side comes to it the many static and striking veins to heat it, and it resists the cold of the blackness rushing to it and digests it, and its flesh is rickety, so that it is easy to accept the black refuse. And another protrusion that grows from its inside and is connected to the mouth of the stomach by which the blackness is pushed into it and covered by a membrane that grows from the peritoneum as it has passed, and it would be empty of the natural blackness as I know, and not for some animals, which their limbs are small. As for the kidneys, each of them is like a semi-circle of convexity that follows the backbone to facilitate bending forward, and its flesh is a sticky flesh so that the substance is strong and not quick to react to what is attracted to it by the sharp water that is accompanied by sharp mixing and to be able to hold the water until the blood separates from it in order to be nourished by it. And because of the ability of the kidneys to hold on to this, man is able to hold urine until the time of his choice, and to prevent it from drying out other than slaves and attracting it, and to rotate by sticking it what is required of its small size, and in the inside of each one of them there is a cavity in which what dissolves into it to distinguish its nutrient and blood force from water and dispose it to its food. Then the water is sent to the bladder, and each of them has a neck connected to the hollow of the liver to attract the watery, and another connected to the bladder to send its water to it, and the right neck is placed higher than the left so that it is closer than the liver. But it was made a pair due to the abundance of water and the narrowing of the place on the liver, the caecum, the spleen, and the colon if it was placed one on one side, and yet it was not equal in height, but rather it would be tilted to its side, or on the stomach and intestines if it was placed in the middle, and with that it prevented bending, to the precedent that every member of the animal created a pair, and he who does not see a pair is twofold, as it appears by pondering on what has passed. And Allah-azwj the Glorious has Said: And from all things, We Created pairs, perhaps you would take heed [51: 49]. As for the bladder, it is a nervous system created from the nerve of the ligament, to be stronger and tighter, and with strength, it can be stretched. It has two layers, and the lining is twice as deep and thick as the epithelium, because it is in contact with sharp water, and it stands with the three actions. And the epithelium is a protection for it so that it does not collapse when it is anchored and stretched, and it is placed between the suture and the pubic region, and it would be a container for urine and a grip for it until it comes out at once by choice and will, so a person will dispense with this from continuing urine like intestines do for pomace. And urine comes to it from the two kidneys outlets as it has passed, and the two outlets. When they reach it, breach one of its layers and pass between the two layers in their length, then they sink into the inner layer, blasting it into the cavity of the bladder to it, until when it is full and anchore