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

The mouse fibril subjected to examination: likewise the meat of the wild bee. Wrinkles, or annular contractions, observed in the meat of the wild bee: their use and description. An examination undertaken of flies, which deposit their eggs in meat. How quickly worms hatch from those eggs. The fleshy fibrils of such flies have similar annular wrinkles. The feet of such flies, and the tendons of the feet, and arteries are examined. Meat extracted from the feet and thorax of fleas, &c. Concerning the parts or annular wrinkles of that creature. Also concerning the annular wrinkles of an ant. An egg extracted by the Author from a cheese mite. The ovary of such a worm perceived most clearly. The filaments, from which the tendon of a whale is composed, and also those which compose the tendon of a fly, do not differ in thickness.

Three species of mosquitoes. Mosquitoes armed with stings, mosquitoes not stinging. Observations on the meat of a mosquito: likewise on the stridulous beetle note: Likely a scarab or similar beetle known for making sound. Its fibrils are not enveloped by a common membrane. Its feet recalled for examination. Description of a fly: Rare observations concerning the beetle. The wild bee does not leave its stings in the bodies it has punctured, &c. Concerning the position of the fleshy fibrils in the feet of winged insects. Observations on the meat of a very fat cow. Why annular fibrils, and alternating motions of contraction and extension, are more easily observed in small animals. Those wrinkles do not have a circular roundness. Concerning the tendon of an ox thigh: The tendons of certain animals agree among themselves in texture and conformation.

Observations on a nautical rope, by which ships are towed. The longer such a rope is, the slower it has its twitchings. Where that rope, if sufficient violence is applied, is to be broken: all of which is applied to fleshy fibrils. The fibril of an ox and a mouse are almost equal in thickness.