130 spider has other insects that prey upon and devour it. In truth there is no insect so small, so far as we know, that has not smaller ones infesting and preying upon it. مسحت في ينتس. I) IALOGUE X. Of Worms. Tut, let is now proceed to consider worms, the last class of the animal creation. Pup. Pray how many orders does that contain ? Tut, it contains five, which are: 1st. Worms with a thread-like body, as the common earthworm, the worms found in the intestines of different animals, &c. 2nd. A uiuiałs of a siimpłe forin, liaked, with (memhers, such as slugs. 3rd. Worms of a soft simple form, covered with a shell. This order is characterized by 118 shell, which each animal forums for itself by a secretion or exudation from the surface of its body. There are three great divisions of shells, viz. Univalves, Bivalves, and Multivalves. There are many different genera of shells under each of these divisions, and the study of them has been denominated Conchology. 4th. The fourth order in appearance approaches nearer to the inanimate creation than the precediug, and includes corals, &c. 5th. The last order is scarcely distinguished from the 1st and 2nd by any other character than the minuteness of the individuals belonging to it, and their spontaneous appearance in animal and vegetable infusions, in which we can discover fio traces of the manner in which they are produced. *
