MEMOIRS 



OF 



THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 



No. 7 



AN EXPERIMENTAL ANALYSIS OF THE 



ORIGIN OF BLOOD AND VASCULAR 



ENDOTHELIUM 



I. THE ORIGIN OF BLOOD AND VASCULAR ENDOTHE- 

 LIUM IN EMBRYOS WITHOUT A CIRCULATION OF 

 THE BLOOD AND IN THE NORMAL EMBRYO 

 FORTY-NINE FIGURES 



II. A STUDY OF WANDERING MESENCHYMAL CELLS ON 

 THE LIVING YOLK-SAC AND THEIR DEVELOPMEN- 

 TAL PRODUCTS: CHROMATOPHORES, VASCULAR 

 ENDOTHELIUM AND BLOOD CELLS 



THIRTY-FIVE FIGURES 



CHARLES R. STOCKARD 



DEPARTMENT OF ANATOMY 



CORNELL UNIVERSITY MEDICAL SCHOOL 



NEW YORK CITY 





PHILADELPHIA, PA. 



Reprinted from THE AMERICAN JOURNAL OF ANATOMY, Volume 18, Nos. 2 and 3, 

 September and November, 1915 



