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

LETTER XXVII. Page 250

A description of a certain illness which had suddenly invaded the Author. The manner in which chyle is pushed through the intestines is explained. The constitution of the stomach, in a body that is in good health, is described. How the intestines, if they are obstructed, impede the expulsive motion of the stomach; how the diaphragm constricts the lungs; how suppressed bile retains the bowels, etc.

LETTER XXVIII. Page 254

Concerning the horizontal and perpendicular vessels of trees. Every year a new bark grows onto trees. Various observations concerning the coconut tree original: "Arborem Cocciferam". To what extent that tree is of benefit to the human race. Concerning its bark, vessels, nodes, filaments, etc. The wood of the Curaçao coconut tree was examined. Observations on the nut of the coconut tree, or the coconut. Concerning its eyes, filaments, vessels, tubules, etc. The plantlet, lurking in the coconut, is described.

LETTER XXIX. Page 279

Concerning the animalcules of the masculine seed. Whether they differ in size. Adult and non-adult animalcules. Whether they are generated in the testicles. They are seen to swim in the seed in swarms. How much seed is voided by the haddock original: "Asello majori" in the space of one month. The membrane of the milt of fish, when it voids seed, abounds with more animalcules in the following year than before. Concerning aquatic animalcules carried onto the land, etc. Masculine seeds and eggs, in fish of the same kind, do not differ in size. Concerning the admirable and sudden multiplication of certain aquatic animalcules. Certain things concerning arteries and veins. Whether blood circulates through the fleshy fibrils.