PART II 



THE DEVELOPMENT OF THE SALIVARY GLANDS IN MAN 



Bv H. Von W. Schulte 



As a result of investigations in the comparative anatomy of the 

 salivary glands begun by Carmalt, and since his untimely death 

 continued by Professor Huntington, a large series of observations 

 have been made upon the conditions that obtain in primates, which 

 are pubhshed elsewhere in the work of which this paper forms a part. 

 The wide range of variation found in these forms, and in particular 

 among the lower primates, has made it desirable to collect for pur- 

 poses of comparison all available embryologic data, limited though 

 they are to observations upon human embryos. The comparison, 

 as might have been expected, shows a remarkable correspondence 

 between the conditions in the various adult primates and the possibih- 

 ties offered in the more generalized embryo. While the embryos 

 vary among themselves, they yet constantly exhibit a potentially 

 more complex organization than is often realized by an individual 

 adult. So that here, as elsewhere, notably in the vascular system, 

 the adult tjpeis attained not alone by progressive development of the 

 anlage, but also by suppression of elements, by simplification of the 

 embryonic plan. Thus a single embryo may present a composite of 

 a large series of adult variations, while on the other hand owing to 

 their minuteness and apparent insignificance, many of the details 

 of the embryonic formations are apt to escape observation that is 

 not guided by a knowledge of adult variants. 



The Hst of embryos on which is based our present knowledge of 

 the salivary glands is not a formidable one. Chievitz ('85) and 

 Bujard ('11) alone have published detailed descriptions of indi\'idual 

 embryos. The interesting and important notices of His ('85), Hammar 

 (02), and Paulet ("11), with the brief memoranda of Sudler ('02), 

 taken together comprise a bare half-dozen pages. That our knowl- 



