376 HISTORICAL. 



first to study the mesenteric chyle-vessels more thoroughly, together with their 

 valves. Pecquet (1648), as a student, found the receptacle for the chyle, Rudbeck 

 and then Thorn. Bartholinus the clear, watery lymph-vessels (1650-1652). Eus- 

 tachius (1562) was familiar with the thoracic duct, which Gassendus (1654) 

 later claimed to have been the first to discover. Lister noticed that chyle was 

 colored blue after the injection of indigo into the intestine (1671). Rudbeck 

 (1652) observed the separation of fibrin in the lymph; Reuss and Emmert(iSoy) 

 were the first to observe the lymph-corpuscles. The chemical examinations 

 date from the first quarter of the nineteenth century, and were made by Lassaigne, 

 Tiedemann, Gmelin and others, of whom the latter also recognized the fact that 

 the white color was dependent upon the fat-granules. 



