De succi pancreatici natura et usu exercitatio anatomico-medica.

De Graaf was an early investigator of the pancreatic secretion. He collected the pancreatic juice of dogs by means of artificial pancreatic fistulae, commenting on the small quantity of juice secreted and on its alkaline character. The French edition, Paris, 1666, contained a revised and enlarged text. Partial translation in J. F. Fulton, Selected readings in the history of physiology, 2nd ed., 1966, pp. 167-68. Full English translation from 2nd ed. (1671), London, 1676.