LYMPHATIC SYSTEM. 127 



being made of a chain vesicles ; as such they are represented 

 by some authors : l but it is an appearance that very seldom 

 occurs j the reader will not observe it in any of the plates 

 which are here laid before him. 



Lastly, the lymphatic system, in different parts of its course, 

 has the glands called conglobate or lymphatic. These glands 

 are so placed that the vessels come in on one side and pass out 

 on the other, in their way to the thoracic duct. Before the 

 discovery of the lymphatic vessels in birds, fish, and turtle, 

 some anatomists have considered these glands as so essentially 

 necessary to the lymphatic system, that they have generally 

 set about discovering the vessels by first looking for those 

 glands ; and wherever they found glands they pronounced that 

 there must be vessels; and when no glands could be seen, they 

 thought it as certain a proof of there being no vessels. But 

 as we know the glands are wanting in some animals, I shall 

 not take notice of their structure and use in this chapter ; but 

 shall speak of them in a future publication (LXIV*), where I 

 shall treat of the spleen and thymus, with which they are 

 connected in their office. 



1 See Nuck's Adenographia. 



(LXIV*.) See the Third Part of these Experimental Inquiries. 



