The Structure and Functions of the hfemolympli Glands and Spleen. 13 



of the hieinal lymphatic variety, occur constantly in the renal region, 

 one on either side of the body, and often in contact with the thoracic 

 duct. The splenic group is not so constant as in the dog, but a good 

 niau}^ glands are as a rule to be found in the subvertebral region and 

 in the mesentery. 



After feeding a cat for some time upon milk, the animal was 

 killed and quickly opened. The lymphatic ducts were filled with chyle, 

 and were easily traceable, on account of the natural white injection 

 contained in them. The hœmal lymphatic glands of the mesentery 

 were found to have a large supply of afferent lymphatic vessels, piercing 

 the capsule at irregular intervals. As a rule, one large efferent vessel 

 proceeds from the gland in the direction of the thoracic duct. 



In the ferret. {Putorius furo.) It is only necessary to state that 

 the glands occurring in the ferret are all haemal lymphatic glands, 

 that they are abundant, and have much the same arrangement as in 

 the dog and cat. The lymphatic supply is also very conspicuous. 



In the stoat {Putorius erminea) and the iveasel {Putorius vul- 

 garis). The hsemal Ijmiphatic glands of these animals show a similar di- 

 stribution to those of the ferret, but are as a rule, not so numerous. 



4. Bodentia. 



In the rat. In addition to the common hroivn rat {Mus decumanus) 

 other species have been dissected, including the blach rat {Mus rattus), 

 several varieties of tame rats (Mus alexandria) and albinos. As I 

 have made a particular study of the position of the glands in these 

 animals, a rather extended account of their general distribution is 

 necessary. It cannot fail to strike the observer, after the examination 

 of a number of these rodents, that the haemolymph glands found in 

 them, show a remarkable constancy in position and in number. The 

 arrangement in over forty rats examined has been observed as practi- 

 cally identical in all. On raising the kidney and carefully tearing 

 away the loose fatty tissue posterior to it, one of the glands is seen 

 lying in the deeply pigmented fat directly anterior to the renal vessels; 

 occasionally two of the organs in close pi'oximity occur in the place 

 of a single larger one; and in many cases one or more similar bodies 



