CAPILLARY SYSTEMS. 155 



Q. How does blood-letting act in inflamnYation of the 

 lungs? 



*fl. It acts by decreasing the quantity of blood which 

 enters the organ; it diminishes the irritation of the vital 

 forces which draws blood to the part and retains it. You 

 well know that as irritation in a part is removed, the flow 

 of blood diminishes. 



Q. How does Beclard say the erectile tissue is formed ? 



. He says it is composed of small arteries and veins, 

 which intercommunicate as the capillary net- work does; 

 and that there is a much greater developmentof the branches 

 of the veins in the erectile tissue. 



