In this first publication of observations made with a microscope, Cesi and Stelluti studied the anatomy of the bee. The text includes classical references to bees as well as new knowledge, integrated in a tabular outline. The title area shows four ancient coins depicting bees, and the crest of the Barberini family showing three busy bees. Because only a handful were printed, the type has bitten deeply into the paper. Oklahoma holds one of only four extant printed copies. This english translation is by Clara Sue Kidwell, formatted by Leah Vanderburg.