130 OEGANISED FLUIDS. 



I am disposed, then, to question the accuracy of the view 

 entertained by Mr. Addison, and to believe that the globules 

 of mucus are formed externally to the blood-vessels ; the 

 mucous glands or crypts which are scattered so abundantly 

 over the surface of all mucous membranes, having a consider- 

 able share in their formation. 



That the mucus-bearing glands are intimately connected 

 with the development of mucous corpuscles seems proved 

 by the fact, that the fluid expressed from them is filled with 

 corpuscles of a smaller size than ordinary mucous globules, 

 and destitute of any admixture with epithelial scales ; these 

 corpuscles certainly could not4have found entrance into 

 the cavities of the glands from without. (See Plate XI. 

 fig. 6.) 



The opinion that the mucous corpuscles are formed ex- 

 ternally to the blood-vessels, is also supported by the observ- 

 ations of M. Vogel, who remarked that the plastic exudation 

 which covers the surface of a recent wound contains, at first, 

 only minute granules : these after a time become associated in 

 twos and threes, and surrounded by a delicate envelope ; 

 finally, fully formed mucous or pus corpuscles appear in the 

 liquid. 



Henle believes that the white corpuscles of the blood, of 

 lymph and of chyle, as well as those of mucus and pus, are 

 elementary cells ; and he says of the pus corpuscles that they 

 are nothing else than elementary cells in process of being 

 transformed into those of the tissue which the organism rege- 

 nerates in the injured part ; and of the white globules of the 

 blood he writes, they are, without the least doubt, transformed 

 into blood corpuscles. 



This opinion of Henle accords closely with that of Addison, 

 who believes, as already stated, that out of the white globules 

 of the blood, all other corpuscles met with in the body are 

 formed, the former escaping from the blood-vessels. 



I also regard the white corpuscles of the blood as elemen- 

 tary or tissue cells, although at the same time the views 

 entertained by myself respecting them differ from those both 

 of Henle and Addison ; thus I do not consider, with the 



