_Pliny_ holds an opinion, that many have their birth or being from a dew that in the Spring falls upon the leaves of trees; and that some kinds of them are from a dew left upon herbs or flowers: and others from a dew left upon Colworts or Cabbages: All which kindes of dews being thickened and condensed, are by the Suns generative heat most of them hatch'd, and in three dayes made living creatures, and of several shapes and colours; some being hard and tough, some smooth and soft; some are horned in their head, some in their tail, some have none; some have hair, some none; some have sixteen feet, some less, and some have none: but (as our _Topsel_ hath with great diligence observed) [in his _History_ of Serpents.] those which have none, move upon the earth, or upon broad leaves, their motion being not unlike to the waves of the sea. Some of them hee also observes to be bred of the eggs of other Caterpillers: and that those in their time turn to be _Butter-flies_; and again, that their eggs turn the following yeer to be _Caterpillars_. 'Tis endlesse to tell you what the curious Searchers into Natures productions, have observed of these Worms and Flies: But yet I shall tell you what our _Topsel_ sayes of the _Canker_, or _Palmer-worm_, or _Caterpiller_; That wheras others content themselves to feed on particular herbs or leaves (for most think, those very leaves that gave them life and shape, give them a particular feeding and nourishment, and that upon them they usually abide;) yet he observes, that this is called a _Pilgrim_ or _Palmer-worm_, for his very wandering life and various food; not contenting himself (as others do) with any certain place for his abode, nor any certain kinde of herb or flower for his feeding; but will boldly and disorderly wander up and down, and not endure to be kept to a diet, or fixt to a particular place.