S U M M A R I U M.

The eye of a whale is examined. How deep whales submerge themselves into the sea. A weight of 23,100 pounds presses upon the eyes of a whale. Why the bottom of the Spanish Sea cannot be explored with a sounding lead original: "bolide". The cornea, in the eye of the whale, is composed of 16 or 18 small membranes.

The hairs of a mouse are described. Most hairs are covered with a cortex. Hairs grow from roots. Hairs do not grow in the manner of plants. They are provided with joints, or nodes. Concerning the hairs of moles, cats, ermines original: "Murium Ponticorum", rabbits, bears, &c. Those hairs are filled with air globules. A more extensive description of hairs. Many hairs are marked with a blackish line.

Concerning beef. Concerning the fleshy fibrils of the feet of mice. Those fibrils are woven from thinner fibrils. Concerning the small membranes, which embrace the fibrils like a net. Concerning mutton, pork, and beef. The fibrils of a pig are not thicker than the fibrils of a mouse. The fibrils of a Danish ox appear thicker than the fibrils of other cattle. The fleshy fibril of an ox and a mouse hardly differ in thickness. Concerning the thinness of the small membranes, &c.

The admirable structure of animalcules, adhering to duckweed. Concerning their cases, motor organs, &c. How they obtain nourishment for themselves by means of very rapid motion. Concerning other animalcules, dwelling in duckweed. By what means animalcules, swimming in a vivarium, might creep into our teeth. Concerning the membranes, covering even the thinnest fibrils.