14 Th. Lewis, 



are observed further towards the anterior end of the kidney than 

 the last. 



These glands may be considered of the hœmal type, though a 

 complete peripheral sinus is rarely present; they are as a general rule 

 flattened oval bodies, varying from ^j^ — 4 mm in length, and about 

 half that breadth. Their colour varies very considerably, but in the 

 renal region they usually contain more blood or pigment than in other 

 situations. Sometimes they have assumed a bright red colouration, in 

 other cases they are brov^n, occasionally they may be pink or light 

 brown, and still more seldom mottled red and brown. The colour is 

 usually confined to one surface, of the organ. 



In further references to this group I shall use the term "renal 

 groupe' (pi. I. fig. 7 r.g). 



Another large and exceedingly constant group of glands is found 

 in the fold of peritoneum slinging the spleen and stomach. These 

 (pi. I. fig. 7 s.g) occur on the course of the splenic vessels. They 

 vary in number from 3 to 10, and are most numerous in the common 

 brown rat. It is often quite impossible to distinguish these glands, 

 which I shall in future refer to as the ''splenic givup", from ordinar}^ 

 lymphatic glands by naked eye observation (so much do they resemble 

 them); for they are occasionally quite white or yellowish, though 

 usually blotched with red (fig. 7 s.g), the blotches indicating the po- 

 sition of the ''peripheral sinuses", occurring within them. In ma.nj 

 cases a red zone is seen encircling the gland peripherally; in rai'e 

 cases they are a full blood red; yet others are tinged brown of various 

 depths. Though usually spherical, one or more may be lenticular; 

 their diameter varies from ^/g — 3 mm. 



This description applies more particularly to albino rats, and tame 

 rats generally; in the wild rat they are always more numerous, and 

 contain more blood or pigment. In the wild rat, too, a few black 

 glands, which are lobulated, occur dorsal to the stomach, and other- 

 wise have the general appearances of ordinary lymphatic glands. 



The opinion has been already expressed that the glands, of the 

 animal under consideration, are of the hsemal variety, as I have been 

 unable to trace any lymphatic vessels to them, nor are lymph corpuscles 



