The Variety and Beauty which present themselves to our Eyes in the Form and Colouring of _Caterpillars_, are no less remarkable than the _Flies_ themselves, as the Reader will be satisfied by examining the following Plates. Of the Change of CATERPILLARS into the _Chrysalis_ State. When a _Caterpillar_ has fed its appointed Time, and is come to full Maturity, it undergoes a Change, and becomes a Body of a different Form, incrusted with a Shell, and usually called a _Chrysalis_ or _Aurelia_; the Shell of which is formed underneath the Skin of the _Caterpillar_, which Skin comes off as soon as the _Aurelia_ becomes perfect. Of the CHRYSALIS or AURELIA. During its Continuance in the _Chrysalis_ State, it seems to have no Sense but Feeling; and some of them have even that in a very low Degree, for they may be touched pretty roughly without moving. The _Chrysalides_ or _Aureliæ_ of the _Butterfly-Kind_ are all very beautiful; some of them look as if they were studded with Gold; some are striped, others spotted, and others mottled with all the various Colours of the Rainbow. But those of the _Moth-Kind_ are not so; differing very little from one another, either in Shape or Colour, except the Magpye, and some few besides. How the _Aurelia_ or _Chrysalis_ is secured. Nothing in Nature is perhaps more deserving Notice, than the many different Methods whereby _Caterpillars_ conceal and secure themselves whilst in this helpless and unactive Condition. Some of them spin a large Case of Silk in Form of an Egg, wherein the _Chrysalis_ lies concealed, till the Time comes for the _Fly_ to make its Appearance, which it does by piercing through this Case. Of such Cases there are several Sorts, different in Form and Colour: Some are long, and drawn out to a Point at each End; others are more round. The Texture of some is very thick and close. Others are thin, like Gause, insomuch that the _Chrysalis_ may be seen thorough them. Some _Aureliæ_ are white, some yellow, and others of different Hues; and most of the hairy _Caterpillars_ intermix their Hair amongst the Spinning. Some _Caterpillars_ form a hard-crusted Case, composed of silk Threads glewed together, in such Manner as to become hard like an Egg-shell, so that when the _Fly_ comes out, a round Hole like a Door appears. The Silk-spinning _Caterpillars_ are of various Kinds, and deposit their _Aureliæ_ in different Places, and in different Manners, _viz._ some fasten them on the Leaves and Stalks of Plants, without any Covering; others spin the Leaves over them; others lodge them in Holes and Crevices; and others in the Earth.