. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. sect rather than at its cast-off clothes. Some Insects are so neat and economical that they devour their old suits or skins soon after moulting them. Larvae, or nymphs, may moult from two or three to ten or mure times; the larvae do not often change strikingly in appearance, but the nymphs gradually acquire the
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. sect rather than at its cast-off clothes. Some Insects are so neat and economical that they devour their old suits or skins soon after moulting them. Larvae, or nymphs, may moult from two or three to ten or mure times; the larvae do not often change strikingly in appearance, but the nymphs gradually acquire the characters and struc- tures of the adult. How They Eat. —To the mouth-parts of an Insect are its most important organs or appen- dages. The mouth-parts are built on two very differ- ent plans. Grasshoppers, beetles, caterpillars and grubs have two pairs of horny jaws, working from side to side, with which they bite or chew off pieces of their food, that then pass into the food-canal for digestion (Pig. 1153). The scale Insects (Pig. 1154), plant-lice, true bugs (Pig. 1155), mosquitoes and others have these jaws drawn out into thread-like organs, which are worked along a groove in a stiff beak or extended under lip. Such Insects can eat only liquid food, which they suck with their beak-like mouth-parts. The Insect places its beak on the surface of the plant, forces the thread-like jaws into the tissues, and then begins a sucking opera- tion, which draws the juices of the plant up along the jaws and the groove in the beak into the food-canal of the Insect. Thus a sucking Insect could not partake of particles of poison sprayed on the surface of a plant. Its mouth-. parts are not built for such feeding nnd is it i^ impi ticable to poison the juice of til ] I nit it i t r 1 fight such Insects with a de i 11 111 11 m 11 Insect must be actually Jut ^ i I knowledge of these fundam ii il iD habits of Insects would h i\ ' i ' im. , money that have been wasted iii ti
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