A good deal of difference of opinion exists as to whether they are the result of arrested growth or of exuberant development, and accordingly whether restricted food or abundant supplies of nourishment are the more necessary for their production.
Honey forms the staple nourishment of many ants, some of the workers seeking nectar from flowers, working it up into honey within their stomachs and regurgitating it so as to feed their comrades within the nest, who, in their turn, pass it on to the grubs.
The parasites, which cling to the intestinal mucous membrane, draw their nourishment from the blood-vessels of their host, and as they are found in hundreds in the body after death, the disorders of digestion, the increasing anaemia and the consequent dropsies and other cachectic symptoms are easily explained.
The medullary rays extend radially from the centre of the tree to the bark at right angles to the grain of the wood, and serve during life to bind the whole together as well as to convey nourishment from one part of the tree to another.
Whenever a woman brings forth a male child, she puts his first food on the sword of her husband, and lightly introduces the first auspicium of nourishment into his little mouth with the point of the sword.
The amount of nourishment required for this rearing is as follows: hatching to first moult, about 9 lb of leaves of tender growth, equal to 40 to 45 lb ripe leaves; first to second moult, 24 lb, representing roc) lb ripe leaves; second to third moult, 80 lb, representing 240 lb ripe leaves; third to fourth moult, 236 lb, representing 472 lb ripe leaves; fourth moult to mounting, 1430 lb, representing 1540 lb ripe leaves, totalling to about one ton of ripe leaves for a complete rearing.
For insects provided with a biting mouth, which take nourishment from the whole leaf, shoot or fruit, the poisonous washes used are chiefly arsenical.
These coming into contact with the roots of plants during their season of active growth, are utilized as direct nourishment for the vegetation.
In the case of muscle, if the available nourishment be sufficient, and if the power of assimilation of the muscle cells remain unimpaired, its bulk increases, that is to say, it becomes hypertrophied.
The endosperm-nucleus divides rapidly to produce a cellular tissue which fills up the interior of the rapidly-growing embryosac, and forms a tissue, known as endosperm, in which is stored a supply of nourishment for the use later on of the embryo.