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

LETTER I. Page 1

CONCERNING the flesh of the whale; concerning the thin membranes covering all the fibrils of the whale. The smallness of those fibrils, etc. The same is applied to bovine fibrils.

LETTER II. Page 9

THE fleshy parts of prawns are examined. Concerning blood globules flowing through the serum. Salts discovered in the blood of the humped prawn. The properties of those salts. The salts of the Haddock original: "Aselli Majoris". The muscles of such a Haddock: and their membranes. The great multitude of those membranes. Certain fibrils of the Haddock are thicker than the fibrils of the whale. The annular circles, or wrinkles, of the whale. The fibrils of bleak fish original: "Apuæ" equal in thickness the fibrils of the whale. Concerning the thin membranes enveloping the fibrils of bleak fish. The fibrils of the mackerel and perch are examined.

LETTER III. Page 23

FLOUR contained in the membranes of beans: likewise in the membranes of wheat. Observations on barley, rye, peas, chestnuts, apples, pears, and the Indian nut, commonly called the coconut original: "Coccum", etc. A description of the coconut. The interior matter of seeds is composed here and there of thin membranes and globules. Concerning oranges and lemons. In most seeds, nourishment is brought by means of a cord. The small plant original: "Plantula" lurking in the seed of the apple is described. Our native trees are provided with more horizontal vessels than those ascending straight: the contrary likely occurs in African, Asian trees, etc. Observations on the leaflets of the young plant.