Antonii a Leeuwenhoek ... Epistolae physiologicae super compluribus naturae arcanis

LETTER XXXIII. Page 318

Tendons divided into septa original: "septa" partitions or small areas. The multiple division of tendons. The connection of fleshy fibrils with the tendons. Concerning the abundant fat found in the membranes of a certain tendon. The membrane covering a tendon spreads out into multiple branches. Concerning the spiral ducts of tendons. All force exerted upon tendons also flows back into the fibrils. The fibrils of an ox and a bee are nearly equal in thickness. Again concerning spiral ducts, or the volumes or coils of fibrils. Various matters concerning the tendons of oysters; concerning the cords of those tendons; concerning the cords and structure of mussels.

LETTER XXXIV. Page 328

An examination of a pig's brain, and its description. The incredible multitude of small veins in the spleen original: "Malo". Other considerations concerning the spleen, and its small membranes. The fibrils of the brain examined. Arteries and veins have no beginning and no end, except in the heart alone. How the body is nourished by the blood of the arteries. The blackish color of the blood is not to be attributed to adult bile, but to a lack of serum. The harms of thicker blood and their remedies.

LETTER XXXV. Page 340

The flesh of the Mordella a type of winged insect examined. Its corneal tunic is equipped with many eyes. A description of that tunic and the eyes themselves. Concerning the eye of the common housefly. The eyes of insects, as well as beetles, crabs, and shrimp, and how they are arranged in an artful order, etc.