S U M M A R I U M.

By what means the eyes of crabs act upon vinegar. A particle of the claw, when heated until it glows, is broken down into innumerable and extremely small salts. An incredible multitude of air globules, erupting from those same claws. Other observations on the aforementioned vinegar, and the salts of the claws. The transparency, splendor, shape, &c., of these salts. Whether crabs change their shell every year. The age of crabs can be estimated from their inner small membrane. Concerning a crab claw macerated in vinegar. The eyes of a crab heated until they glow over a burning coal, &c. Salts produced from those eyes. Observations on sea crawfish or lobsters original: "Carabos"; and on their claws blunting vinegar; &c.

Sage examined by sight. Whether it is covered with spiders or spider webs. Concerning the veins of sage. An incredible abundance of oil besets and smears the parts of sage. Whether worms original: "Vermiculi" lie hidden in sage, and also in fennel. Kircher is criticized note: Athanasius Kircher, whose theories on spontaneous generation Leeuwenhoek disputed.. No animalcules are produced from the plant, leaves, &c. Observations on the cheese mite. The toad and the frog do not sprinkle their poison onto the plant unless provoked. It is false that no flying animalcules produce living offspring. By what means flies increase, &c. Again concerning sage. Why a reed and straw had to be strengthened with joints. Concerning the horizontal vessels of trees, and their use. Certain things concerning tea.

Observations on beef, chicken, and mouse meat: The fibril of the ox, the chicken, and the mouse differ little in thickness.

Observations on the meat and membranes of a cow. Larger fibrils, and also membranes, divided into smaller ones. Chicken meat examined.