EARLY PULSATIONS OF LYMPH HEARTS 393 



due to the growing intensity of the stimulus from within, occa- 

 sioned by the constantly increasing flow of lymph. But further 

 histological and experimental investigations are necessary for the 

 complete explanation of the early pulsations of the lymph heart 

 in chick embryos. 



Many of the observations for the present article were made 

 at the Marine Biological Laboratory at Woods Hole, Massa- 

 chusetts, and we wish to express our thanks to Dr. Lillie and to 

 Dr. Drew for the many courtesies extended to us there. 



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