As a naturalist, Swammerdam is chiefly celebrated for the extent and accuracy of his inquiries into the structure of insects; though anatomy and physiology are equally indebted to his labours. He was the first who discovered the method of rendering the blood-vessels more easy to be traced in dissection, by injecting them with coloured wax in a fluid state; and although he cannot for that reason alone claim all the discoveries that have been made in anatomy, any more than the first person who skinned birds can claim the honour of determining the numerous species that have been conveyed from distant countries, or he who first cut a slice of petrified wood, all the results that have emanated from his experiment, yet he certainly devised the means of extending our knowledge of the human body as well as of pathology. His works on insects are the following:--1. The General History of Insects, published in Dutch at Utrecht in 1669, and subsequently in French and Latin, in which he gives a classification of these animals, founded on their structure and metamorphoses. 2. The History of the Ephemeris, published in Dutch at Amsterdam in 1675, and in Latin at London in 1681. 3. The Biblia Naturae, sive Historia Insectorum in Classes Certas Redacta, Leyden, 1737-38, 2 vols folio, which has been translated into German, English, and French. This important work was published after his death by Boerhaave, in Dutch and Latin, and contains a masterly exposition of the structure of such insects as came under his observation.