Instructions for collecting and preserving various subjects of natural history; as animals, birds, reptiles, shells, corals, plants, &c. Together with A treatise on the management of insects in their several states; selected from the best authorities. By E. Donovan,:
Donovan, E. (Edward), 1768-1837.
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THE EGG.

THE eggs of an Insect are always small, compared with the size of the Insect itself; they vary in number and figure in different species; some are round, others oval; some are cylindrical, and others nearly square; the shells of some are hard and smooth, while others are soft and flexible. It is a rule, but is not invariable, that the eggs never encrease in size after they are laid.

They are found of almost every shade of colour, and are always disposed in those situations where the young brood may find a convenient supply of proper food; some Insects deposit their eggs in the oak-leaf, producing there the red gall; others cause a similar appearance on the poplar-leaf, and the red protuberances on the willow-leaf, and the termination of the juniper branches are pro∣duced by like means: the leaves of some plants are drawn into a globular head by the eggs of an Insect lodged therein; and many curious circumstances relative to this oeconomy might be noticed if the nature of our plan would permit.

The Phryganea, Libellula, Gnat, Ephemera, &c. hover all day over the water to deposit their eggs, which are hatched in the water, and remain there all the time they are in the larva form. Many Moths cover their eggs with a thick bed of hair which they gather from their bodies, and others cover them with a glutinous composi∣tion, which, when dry, protects them from moisture, rain, and cold; and the Wolf-Spider carefully preserves its eggs in a silk bag, which it carries on its back: by some Moths they are glued with great symmetry round the smaller branches of trees, or are secreted beneath the bark, and frequently in the crevices of walls, in hollow stalks, &c.