but, as regards the formation of saliva, he had recourse to fantastic 

 views of the action of the succus nerveus. He failed to grasp the 

 significance of his important discovery. His name is also associated 

 with " Wharton's jelly " of the umbilical cord. 



ORIGINAL FIGURES OF WHARTON's 



DUCT OF THE SUB-MAXILLARY 



GLAND OF A CALF. 



STENOS ORIGINAL FIGURE OF THE PAROTID 



DUCT AND LABIAL GLANDS OF THE 



MOUTH OF A CALF. 



REGNER DE GRAAF. 



1641-1673 (aet. 32). 



THIS brilliant pupil of F. Sylvius was born at Schoonhaven, 

 and practised at Delft, where he died in 1673, a year after his 

 master, whose Chair he felt himself unable to accept. When a 

 student, and as yet only twenty-three, he experimented on the pancreatic 

 juice, made a temporary fistula, and collected the juice. The figure 

 reproduced shows in part how the juice was collected, very much as 

 it was collected by subsequent observers. It is interesting to note 

 that a similar receptacle is shown in connection with the parotid 

 duct. By the same method he also obtained bile from the bile 

 duct, but Malpighi, before this, had made a biliary fistula. He 

 published his observations, Disputatio medico, de natnra et ttsu Sued 

 Pancreatici, 1664. In the case of the pancreas he notes that only 

 a small quantity of juice was obtained, which agrees with modern 

 observations on fistulte made in a somewhat similar manner. The 



