MAMMALIAN ALVEOLINGUAL SALIVARY AREA 331 



the dorsal relation for a large number of mammals, and his results 

 have been conhrmed and exended by recent observers. The sublingua 

 lis major thus appears essentially as an intermediate element between 

 the lesser sublmgual series and the submaxillary complex, while all three 

 correspond evidently to sagittal and not transverse divisions of a 

 prnnitive gland field. 



Reichel occupies a position in a way intermediate between that of 

 the anatomist and the embryologist, for while formulating his inquiry 

 in the spirit of a morphologist, he sought its solution in the facts 

 of embryology. The problem for him was purely one of homolo-^y -- 

 what glands are present in mammals, and to what glands of lower forms 

 are they equivalent ^ The embryological problem proper, the nature 

 o the developmental process, can hardly be said to fall within his 

 pkn. His work is remarkable for extent of information, critical insight, 

 and the power of bnlhant generalization, and productive of results 

 wkch, after due allowance for the intellectual virtue of the man him- 

 self redound to the credit of the method of morphology, as compared 

 with the methods of the half-morphologists and their hampering 

 self-hmitation to the partial field either of anatomy or of embryology 



Reichel s work forms, therefore, a convenient approach to the more 

 special study of the developmental process. After a critical analysis of 

 the data afforded by comparative anatomy, in which he detected the 

 prevalent confusion of the sublinguales minores and major he pre 

 sents an exceedingly condensed report of his findings in a few embrvos 

 he examined many) and then formulates his conclusions, recognizing 

 the Riviman and Barthohnian elements as distinct glands, variable in 

 the degree of their development in different forms. The anlage of 

 he submaxillary he located in a furrow beside the developing tongue 

 sulcus linguahs ; the subhnguahs major he assigns to a parallel and 

 ectal sulcus; _ the subhnguales minores arise, also, from these same 

 furrows in series, but caudal to the larger sprouts of the two complex 

 g ands. These observations were made upon a "rather young embryo 

 ot he mouse." The relation of the submaxillary and the greater 

 subhngual ducts IS correctly given, but the caudal position and the 

 sulcal relations here assigned to the lesser subhnguals are, at first 

 sight extremely perplexing (vide infra). But few other data are given 

 The larger ducts are stated to move forward and acquire prefrenular 



