32 Th. Lewis, 



These observations are based on direct naked eye appearances only.^) 



The changes seem to be very similar to those taking' place in the 



spleen when similarly stimulated, and are probably brought about by 



contraction of the abundant involuntary muscle fibres in capsule and 



trabeculae. No rhythmical contractions have been observed in any 



glands. 



IX. Lymphatic supply. 



In the glands of the rat I have failed to And any definite lym- 

 phatic vessels of any sort; the same observation applies to hœmal 

 glands generally. 



In the haemal lymphatic glands of the cat, dog, and ferret, there 

 is no difficulty in finding large vessels containing nothing but lymph 

 corpuscles in many parts of the organ. The method adopted for 

 tracing the vessels was as follows: A cat was fed on a fatty diet in- 

 cluding milk, and a few hours afterwards killed and quickly opened. 

 The lymphatic vessels were charged with white chyle, and many were 

 traced to the glands at different points. Sometimes as many as six 

 to ten of these afferent vessels pierced the capsule, while one large 

 efferent vessel led away from it. Such a gland was quickly excised 

 and fixed and hardened in Flemming's solution or osmic acid. The 

 chyle was thus stained black, wherever present in the gland, and 

 formed a natural injection, by which the lymphatic circulation could 

 be ascertained. Sections of the gland showed the sinuses stained black 

 in many places, indicating that the chyle stream has a direct connec- 

 tion with them. When preparations of the corresponding glands were 

 made by other methods these sinuses were seen to contain many blood 

 corpuscles, so that one can but conclude that in the sinuses there is 

 a mixture of blood and lymph. 



X. An account of Phagocytosis in the heemolyxnph 

 series of glands. 



1. The phenomena of Phagocytosis. 

 The process of phagocytosis is remarkably well seen, in all its 

 stages, in the hœmal glands of the rat; the most satisfactory results 



^) The difficulties of obtaining graphic, records of such changes are obvious. 



