152 PRACTICAL HISTOLOGY [XIX 



absent and a reticulum of fine fibres may be seen. 

 Some leucocytes and red blood corpuscles not washed 

 out of the reticulum will be present. 



The reticulum of the Malpighian corpuscles re- 

 sembles that of the follicles of lymphatic glands, in 

 its meshes are many leucocytes, but no red blood 

 corpuscles. 



The small arteries, capillaries and veinlets of the 

 pulp ; the veinlets branch out from the trabeculae and 

 have sharp outlines with nuclei at intervals (they may 

 usually be recognized in the dog by the spiral lines 

 running round them). 



The trabeculaB are chiefly composed of unstriated 

 muscle tissue (the amount of this varies in different 

 animals, in some it is very small). 



If a section be stained with orcein (cp. p. 82) a network of small 

 elastic fibres will be shown in the trabeculae. 



On the arterial capillaries in the pulp small round clumps of 

 flattened connective tissue cells may in places be seen. 



3. Section of spleen injected with Prussian blue 

 from the splenic artery under a low pressure. Mount 

 in balsam. Note (1. p.) 



The small arteries having a sheath of lymphoid 

 tissue, which here and there forms a Malpighian 

 corpuscle ; the artery lies excentrically in the corpuscle, 

 and gives off a number of capillaries which form a 

 network in it. 



Capillaries in the lymphoid sheath of the arteries, 

 but less numerous than in the Malpighian corpuscles. 



Small arteries (arterial capillaries) without lymphoid 

 sheath branching in the splenic pulp. 



