■i .'.'. : ibin. 



Morpiioi ; Lymphai 5 : \l. 



I' u d m the following pages that the lymphal iblem 



i- closely connected with, or rather is a fundamental part of, the 



thai the study of the « thro* on the 



or. to put it more strongly, that the same kind of 



rohlems. The fundamental morpb the 



lymphatic system has, howi en put on a i v sal 



asculai ring 



rst lymphatics bud ofE from the veins. Moreover, 

 lympha n at a comparatively late stage, long after the forma- 



tion of ' ! islands has 



[I. HISTORICAL. 



1. V iSA S] ROSA. 



I mil the primary origin of anj system is known our co 

 it a essarily hazy and vague and this is oowhere better illus- 

 trated than in i tion with the lympha em. The views of 

 eenth century may well be summed up in the hypothetical 

 sa " of Boerhave (13), Sailer (41) and others, which were 

 tiny channels too small to allow corpuscles to pass, supposed to connect 

 arte] ins and lymphatics at their tips. The conception which 

 underlies vasa serosa may be traced hack to the experiments of NTuck 

 (100), who injected air into the arteries and found it r< g in 

 the lymphatics, as may be represented in the diagram Vasa 

 >sa meant the idea that the arteries finally branched into vessels too 

 tiny to carry the corpuscles, but the term likewise repri a whole 

 ague conceptions, such as Bichat"s (r>i ahsorbents and ex- 

 iants, which soughl to make definite - ■ idea of the nature of 



lymphatics. 



2. Ly M I'll \ti< - with ( )i'i;\ Moi I us. 



In the latter half of the eighteenth century the conception o 



was modified through the work of William Hunter (50) 



: Munro, who believed that lymphatics began with open mouths. 



The views of these English observers, at shown bj Cru (23), 



involved the idea that the mouths of the lymphatics opened directly 



'face of the body, into the cavity of the intestine and the 



air - well as into I issues. T ie theory 



ed with disi I ie lym] lusive 



