THE AORTA. 



347 



FIG. 102. THE AORTA, WITH ITS MAIN 

 BRANCHES IN THE THORAX AND RIGHT 

 ARM; VENTRAL VIEW; xl. A. ORIGIN 

 OF THE CAROTID ARTERIES; x 1. B, C. 

 VEINS WITH VALVES ; Quain, A, II, 174. 



The Wickersheimer's fluid prevents the brittleness that is so objec- 

 tionable in plaster injected vessels that are dried. 



B and C Preparation. B. A segment of the V. jugularis 

 externa about 5 cm. long was slit lengthwise and placed in water, 

 and the valves floated up by blowing into the little pockets with a 

 blow-pipe. 



C. The external jugular or femoral vein was injected peripherad 



