198 ELEMENTARY PHYSIOLOGY. [XVIII. 



Clear and mount in Canada balsam. Note under 

 a low power 



a. The small arteries branching off to the Mal- 

 pighian corpuscles; the artery penetrates the 

 corpuscles usually excentrically, and either 

 divides into a number of capillaries which 

 form a network in the Malpighian corpuscle, 

 or passes on into the pulp giving off a branch 

 which divides into capillaries in the corpuscle. 



b. Capillaries in the adenoid sheath of the arte- 

 ries, but less numerous than in the Malpighian 

 corpuscle. 



c. Small arteries dividing into capillaries in the 

 splenic pulp. 



d. Small tufts of splenic pulp injected with 

 blue at the ends of the capillaries of the pulp. 



e. Irregular masses of injected splenic pulp out- 

 side the Malpighian corpuscles and adenoid 

 tissue of the arteries where the capillaries 

 open out into the pulp. 



If too great a pressure has been used in injecting, 

 instead of the tufts of injected pulp at the end 

 of the capillaries, irregular areas of the pulp or 

 the whole of it will be permeated with the Berlin 

 blue; the Malpighian corpuscles and the adenoid 

 tissue of the arteries will be free from injection 

 unless the pressure used in injecting has been 

 very great. 



