Dissertations relative to the natural history of animals and vegetables [electronic resource] : Translated from the Italian of the Abbé Spallanzani, Royal Professor of Natural History in the University of Pavia, Superintendant of the Public Museum, and Fellow of various learned Societies. To which are added two letters from Mr. Bonnet to the author. And (to each volume of this translation) an appendix, the first containing a Paper written by Mr. Hunter, F. R. S. and the Experiments of Dr. Stevens on Digestion; the second a Translation of a Memoir of Mr. Demours, and Mr. Debraw's Paper on the Fecundation of Bees.