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Updated: September 20, 2025
While plants furnish them with nitrogenous food, they can not give it back to the plants. Urea is the form in which the nitrogen is commonly excreted from the animal body. But urea is not a plant food; for ordinary plants are entirely unable to make use of it.
Afterwards, I allowed an ant to visit them, and it immediately seemed, by its eager way of running about to be well aware what a rich flock it had discovered; it then began to play with its antennae on the abdomen first of one aphis and then of another; and each, as soon as it felt the antennae, immediately lifted up its abdomen and excreted a limpid drop of sweet juice, which was eagerly devoured by the ant.
Long before the offspring reach even into the millions their rate of multiplication is checked either by lack of food or by the accumulation of their own excreted products, which are injurious to them.
The reason is not clearly known, unless it be from the sudden retention of poisonous exhalations. The Skin and the Kidneys. There is a close relationship between the skin and the kidneys, as both excrete organic and saline matter. In hot weather, or in conditions producing great activity of the skin, the amount of water excreted by the kidneys is diminished.
It is probable that there is likewise a notable diminution in the amount of urine excreted, as this is a common accompaniment of hysterical manifestations such as hers. In some instances the function appears to be almost entirely arrested, as was the fact in a case described by M. Charcot, and in two which have come under my own observation.
These organisms, existing, as we have already seen, in the air, in the soil, in the water, and always ready to seize hold of any organic substance that may furnish them with food, feed upon the products of animal life, whether they are such products as muscle tissue, or fat, or sugar, or whether they are the excreted products of animal life, such as urea, and produce therein the chemical decomposition changes already noticed.
In our plant-eating ancestors this rudimentary organ was much larger and had a useful function. Finally, we have important appendages of the alimentary tube in the bladder and urethra, which belong to the alimentary system. These urinary organs, acting as reservoir and duct for the urine excreted by the kidneys, originate from the innermost part of the allantoic pedicle.
Augmentation of assimilation. 2. Reduced disassimilation. In the former, he insists water must be interdicted, while in the latter it may be allowed ad libitum. Again, in order to recognize the exact variety of obesity, he divides his patients into three classes, each recognizable by the volume of urea excreted.
Thus in ancient times, with regard to men who wished to grow rich, they could grow rich if their hearts were as good as possible. As for bad-hearted men, the gods became angry at all their various misdeeds. It was for this reason that, on account of their anger, even a gold puppy excreted nothing but dung.
Let us now suppose a little sweet juice or nectar to be excreted by the inner bases of the petals of a flower. In this case insects in seeking the nectar would get dusted with pollen, and would certainly often transport the pollen from one flower to the stigma of another flower. Some of these seedlings would probably inherit the nectar-excreting power.
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