Q,yv^y^J^yUU(i^■'<fu^ 'A^u'^^.^^^^^.^c.^Ji n 



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 EMBRY'OS WITHOUT A CIRCULATION OF 

 THE BLOOD AND IN THE NORMAL E:MBRY^0 



FORTY-XINE FIGURES 



II. A STUDY^ OF WANDERING MESENCHYMAL CELLS ON 



THE LIVING YOLK-SAC AND THEIR DE\ ELOPMEN- 



TAL PRODUCTS: CHROMATOPHORES, VASCULAR 



ENDOTHELIUM AND BLOOD CELLS 



THIRTY-FIVE FIGURES 



CHARLES R. STOCKARD 



DEPARTMENT OF AN'ATOSfY 



CORNELL L-NIV'ERSITY MEDICAL SCHOOL 



NEW YORK CITY 



PHILADELPHIA, PA. 



Reprinted from The American Journal of Anatomy, Volume 18, Nos. 2 and 3, 



September and November, 191 5 



