/' ■ • /.'. Sabin. 



1 - ■ ■ ■ ; o Endoi in in m. 



In contrast to these hypothetical relationships of lymphatics, the 

 work of von Recklinghausen (119) gave the first definite theor} which 

 was actually based on the interpretation of direct observations of I 

 lymphatic capillary. Through the use of silver nitrate solutions re- 

 duced in direct sunlight, he discovered that the lymphati d by 

 a definite cell layer of endothelium. This is clearly one of the most 

 important discoveries in histology. Von Recklinghausen interpreted 

 the silver pictures to d at the finest lymphatic capillaries were 

 lined by an epithelium, but that these capillaries communicated bj 

 wide openings with Saftcanale or lymph radicles, which formed 

 the real ro< the lymphatics. Subsequently he described rm 

 ■ it <■ openings lata in the serosa of the diaphragm < 120). 



Fig. ?,. — Diagram to show von Recklinghausen's theory of the relation of 

 lymphatics to tissue spares. All of the tissue spaces are cross-hatched to 

 indi' lOthetical lymphatics. 



The von Recklinghausen figures seemed to offer a perfectly 

 to" Qstration of the relations of open lymphatics, especially in 



view of the fact that thi f anatomists already b 



i» o atics. But it is of gnat interest to follow the writu 



Hi- at this pen',,,]. His (in. who was just publishing in favoi 

 open lymphatics, and saw von Recklinghausen's paper as his own v. 

 ng to press, at fii jnized in von Recklinghausen's des riptions 



rmation own views. On careful studying of the silver 



pictures, however. Hi- | i.o saw that the discovery of endothelium was 

 step whii . insl ad of proving that lymphatics are open and 



