ON THE LYMPHATIC SYSTEM. 175 



then, a different morphological relation to tlie mucous cells from 

 that existing in the submaxillary of the dog, in the latter forming 

 crcscentiug groups outside the mucous cells. Whether in the 

 submaxillary of the dog the albuminous cells of the crescents are 

 under ordinary conditions destined to replace the mucous cells, 

 these latter becoming altogether destroyed, as maintained by 

 Ileidenhain and his pupils, is a subject into which I cannot here 

 enter, I have expressed myself against this view in my former 

 paper (' Quarterly Journal of Micr. Science,^ April, 1879), and I 

 have seen in my specimens nothing since to make me alter this 

 view, nor have I read in Heidenhain's latest article on this sub- 

 ject any new arguments which would place his assertion on a 

 more firm basis than it stood previously. 



But this I must add, that I see no reason whatever for 

 grouping together, as Ileidenhain does, the albuminous cells 

 lining the lumen of the alveoli in the subhngualis of the dog 

 with the albuminous cells that forms the crescents in the dog's 

 submaxillary gland. The former, besides their different relation 

 to the mucous cells, under ordinary conditions undoubtedly 

 change into the latter, a fact that, to my mind, has yet to be 

 proved for the cells of the crescents in the submaxillary of tlie 



The last subject that I wish to mention is the distribution of 

 ganglia in the salivary glands that were examined. In the 

 parotid in none of the above animals were there found groups of 

 ganglion cells in connection with the nerve branches, nor isolated 

 ones either. 



In the submaxillary of the dog the ganglia are notorious, and 

 are very conspicuous by their number and size. In the sub- 

 maxillary of the rabbit and the conditions are about the same. 

 In the submaxillary of the ape the ganglia are present, but in 

 smaller numbers than in the preceding animals. In the human 

 submaxillary the ganglia are insignificant, both as regards size 

 and numbers. In the submaxillary of the guinea-pig I have 

 not been able to find any. 



The sublmgualis also differs in this respect in the different 

 animals. lu the dog I miss them, while in the rabbit and 

 guinea-pig they are very conspicuous ; they are found, as shown 

 in fig. 15, in connection with the nerve-trunks accompanying the 

 chief duct of the gland. 



