THE DEVELOPMENT OF THE JUGULAR LYMPH 



SAC IN BIRDS 



A. M. MILLER 

 From the Anatomical Laboratory of Columbia University 



TEN FIGURES 



In view of the work done within recent years on the develop- 

 ment of the lymphatic system in mammals, it has seemed desir- 

 able to extend the study of this system to other vertebrate forms. 

 The investigation of conditions in the chick was undertaken at 

 the suggestion of Dr. Huntington, and has been conducted under 

 his supervision. 



The detailed study of closely related early stages in the devel- 

 opment of the mammahan jugular lymph sac (Huntington and 

 McClureO, and their complete agreement with corresponding 

 genetic stages in reptilian embryos (Huntington^) warrant defi- 

 nite conclusions respecting the ontogeny of the avian lymph sac 

 based on a relatively smaller and less closely graded series of 

 embryos. In fact, one of the chief purposes of the publications 

 above referred to is the definite establishment of the genesis of 

 the lymph sac in a representative mammalian form in such detail 

 that it may serve as a comparative basis not only for other mam- 

 malian embryos but for embryos of the remaining amnio te classes. 

 It is evident that the chick embryos here described and figured 

 could by no possibility agree as completely as they actually do 

 with the corresponding mammalian stages if the development of 

 the jugular lymph sacs differed in any essential respect from that 



1 George S. Huntington and Charles F. W. McClure : The Anatomy and Devel- 

 opment of the Jugular Lymph Sacs in the Domestic Cat (Felis domestica). The 

 American Journal of Anatomy, vol. 10, no. 2, 1910. 



2 George S. Huntington: The Development of the Lymphatic System in the 

 Reptiles. The Anatomical Record, vol. 5, no. 6, 1911. 



THE AMERICAN JOUKNAL OP ANATOMY, VOL. 12, NO. 4 



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