4 I2 



THE DUCTLESS GLANDS. 



which enter the interior of the organ, and, dividing and 

 anastomosing in all parts, form a kind of supporting 

 framework or stroma, in the interstices of which the 

 proper substance of the spleen, or the spleen-pulp, is con- 

 tained. At the hilus of the spleen, or the part at which 

 the blood-vessels, nerves, and lymphatics enter, the fibrous 



coat is prolonged into the 

 spleen-substance in the form 

 of investing sheaths for the 

 arteries and veins, which 

 sheaths again are connected 

 with the traleculcB before re- 

 ferred to. 



The spleen-pulp, which is 

 a dark-red or reddish-brown 

 colour, is composed chiefly 

 of cells. Of these, some are 

 granular corpuscles resem- 

 bling the lymph- corpuscles, 

 both in general appearance 

 and in being able to perform 

 amoeboid movements ; others 

 are red blood- corpuscles of 



normal appearance or variously changed; while there are also 

 large cells containing either pigment allied to the colouring 

 matter of the blood, or rounded corpuscles like red blood- cells. 

 The splenic artery which enters the spleen by its con- 

 cave surface or hilus divides and subdivides, with but 

 little anastomosis between its branches, in the midst of the 

 spleen-pulp, at the same time that its branches are 



* Fig. 107. Transverse Section of a Lobule of an Injected Infantile 

 Thymus Gland (after Kolliker) (magnified 30 diameters), a, capsule 

 of connective tissue surrounding tlie lobule ; b, membrane of the 

 glandular vesicles ; c, cavity of the lobule, from which the larger blood- 

 vessels are seen to extend towards and ramify in the spheroidal masses 

 of the lobule. 



