. 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. r-^ 1139. Larva of a sphinx moth. 1138, Nymphs of the four-lined leaf-bug and adult of the tarnished plant-bug. The smallest one is the njTiiph recently hatched. The nest is the uymph after the lirst moxilt. The imago is shown at the right. Hair lines at the right of nymphs, and small figure near imago indicate
. 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. r-^ 1139. Larva of a sphinx moth. 1138, Nymphs of the four-lined leaf-bug and adult of the tarnished plant-bug. The smallest one is the njTiiph recently hatched. The nest is the uymph after the lirst moxilt. The imago is shown at the right. Hair lines at the right of nymphs, and small figure near imago indicate the natural size. in many adult Insects. Caterpillars and other larvse pos- sess only simple eyes. It is thought that each facet of the compound eye sees a part of an object; thus the whole eye wotild form a mosaic picture on the Insect's brain. The simple eyes doubtless see as our eyes do, and seem to be best adapted for use in dark places and for near vision. Insects do not see the form of objects distinctly, but their eyes are doubtless superior to ours in distin- guishing the smallest movements of an ob- ject. Itis now supposed that no Insects can dis- tinctly see objects at a greater distance than 6 feet. It must be a sixth sense, a sense of direction, which en- ables the bee to find its way for a mile or more back to its home. In- sects are doubtless able to distinguish the color of objects, and some Insects seem to prefer certain colors. Blue is said to be the favorite color of the honey-bee, and violet that of ants; ants are also apparently sensitive to the ultra- violet rays of light, which man cannot perceive. It is generally supposed that the shape and high colors of flowers attract Insects: but recent ex- periments seem to show that Insects are guided to flowers by the sense of smell rather than by sight. The hard outer skin of an Insect has no nerves distributed in it, hence ^f\ it is not sensitive; but it is pierced X'with holes, in which grow hairs that are in c
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