THE CIRCULATION OP THE BLOOD. 



221 



Fig. 192. — Capillaiy blood-vessels (Landois). The cement substance between the en- 

 dothelium has been rendered dark by silver nitrate, and the nuclei made prominent 

 by staining. 



smaller end toward the heart and the widest portions repre- 

 senting the capillaries. 



Fig. 193.— Diagram to illustrate the relative proportions of the aggregate sectional area 

 of the different parts of the vascular system (after Yeo). &, aorta; C, capillaries; 

 V, veins. 



