270 GEO. S. HUNTINGTON 



The more recent investigations in this field, covering a wider 

 range of vertebrate embryos, have, however, yielded such deci- 

 sive results that we are now enabled and entitled to make a closer, 

 and in my opinion more correct, analysis of the mutual rela- 

 tions between developing haemal and lymphatic channels. 



From this new standpoint the significance of the jugular lymph 

 sacs in the general plan of the entire vascular system must be 

 revised and distinctly modified. 



It is gf course evident that the same corrected and modified 

 interpretation must be assigned to all lymphatico-venous con- 

 nections of adult vertebrates homologous to the amniote jugular 

 lymph sacs, whether they appear as distinct and fully developed 

 lymphatico-venous hearts or as more or less reduced and modified 

 representatives of these structures. 



While these recent investigations of the early developmental 

 stages of the vertebrate vascular system have made it possible 

 to take a more generalized view of the phylogenetic and onto- 

 genetic relations of the lymphatic to the haemal department of 

 the general vascular system, they have, at the same time, thrown 

 much additional and new light on the probable functional sig- 

 nificance of the primitive vascular channels, and on certain 

 physiological phases of the early vertebrate lymphatic apparatus. 

 The researches here cited have been in part already published, 

 while the remainder still await publication. I owe it to the 

 courtesy of my colleagues and associates that I have been privi- 

 leged to follow the progress of their work and am permitted to 

 refer to some of their results at this time. The published papers 

 are as follows: 



F. A. Stromsten 1910 A contribution to the anatomy and development of the 

 posterior lymph hearts in turtles. Publication no. 132 of the Carnegie 

 Institution of Washington, pp. 77-87. 



1911 On the relation between mesenchymal spaces and the develop- 

 ment of the posterior lymph hearts in turtles. Anat. Rec, vol. 5, 

 April, pp. 173-178. 



1912. On the development of the prevertebral (thoracic) duct in turtles 

 as indicated by a study of injected and uninjected embryos. Anat. 

 Roc, vol. 6, pp. 343-356. 



Geo. S. Huntington 1911 The development of the lymphatic system in rep- 

 tiles. Anat. Rec, vol. 5, pp. 2G1-276. 



