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that rats have while Drummonp (5) stated that although only small 
hemolymph nodes are present in the rat, these are very constant in 
position. Drummonp also spoke of certain glands in the rat in which 
certain hyaline cells derived from lymphocytes, were so numerous that 
all the erythrocytes of the node were contained in them and that 
this is still commoner in the dog. Drummonp stated, however, that 
although he tried injections he could not distinguish between hemo- 
lymph and lymphatic glands but nevertheless added that the arterial 
system of the hemolymph glands of dogs is so well developed that he 
counted two dozen arteries in cross-section in a gland one fourth of 
a millimeter in diameter. Herry (13) also stated that hemolymph 
glands containing lymph vessels are present in the dog and rat and 
that arterial injections of the latter change their color but that such 
results are not obtained in the sheep. 
Wuirer (33) reported hemolymph glands constantly present in 
small numbers and as having been found in two out of six rabbits. 
Baum (1) who divided the lymph nodes of domestic animals into those 
with and those without lymphatics found only an occasional specimen 
in the dog. This statement of Baum’s is all the more significant since 
he considered one class of hemal nodes as having afferent and 
efferent lymphatics. Pırrz (20) who wholly denied their presence 
in dogs and cats, also stated that he could not produce them by 
splenectomy, and that blood destruction occurs constantly in the lymph 
nodes of these animals. This last statement of Pırız’s is especially 
interesting in connection with the work of RETTERER (22—24) and of 
Rerrerer and Letiivre (25). From experiments on dogs and guinea 
pigs these investigators concluded that a hemolymph gland is nothing 
but a lymph gland in which blood cells have for some reason gotten 
into the parenchyma and the lymph sinuses. A similar position is 
taken by Merk (16) regarding man and the guinea pig, in the latter 
of which Merk claimed the experimental production of hemolymph 
nodes to be very easy. 
Although the earlier investigators did not recognize a distinction 
between lymph and hemolymph nodes some of them nevertheless spoke 
of the occurrence of red lymph nodes before and also after splen- 
ectomy, in dogs. Foa (8), for example, found red lymph nodes in 
only one dog after splenectomy. These findings Foa attributed to 
congestion and sepsis. Mosier (19) also emphasized the fact that he 
never saw such hyperplastic lymph nodes as found in one dog after 
Lif Ge 
