100 J. B. CLELAND. 
and maroon (due to blood). The cells contained numerous 
large and small fat globules. 
Necrotic Tubercles in the Lungs, due to a Diphtheroid 
Organism.—In a specimen of KH. rattus the lungs were 
speckled with numerous small white nodules the size of 
pins’ heads. There was a small abscess with thick pus near 
the base of the penis. Smears from the areas in the lungs 
showed. numerous long, somewhat irregular, thin Gram 
positive diphtheroid bacilli, which were isolated in pure 
culture and gave acid in glucose, lactose and saccharose, 
and no reaction in mannite and dulcite. A euinea-pig in- 
oculated with the culture died in three weeks—no lesions 
were found in it- A rabbit similarly inoculated was killed 
24 months later, and found to be normal. 
Microcystic Kidneys —1 have an impression that the 
kidneys of EH. norvegicus are more subject to small cysts 
than those of E. rattus. I have a record of microcystic kid- 
neys in EL. rattus, in which many of the ducts were dilated 
to various degrees, with round-celled infiltration and blood 
pigment between the tubules. 
Cystic Spaces in the Lung.—The animal affected was a 
tame white rat (H. norvegicus var. albina). The lower 
half of one lung was occupied by cystic spaces filled with 
thick glutinous contents. Microscopically, the spaces were 
lined by one to several layers of somewhat flattened cells. 
** Hlephantiasis.’’—Both hind legs of an EF. norvegicus 
were enormously thickened and fibrosed from the ‘‘ankle- 
joints’’ downwards. Apparently the animal had been 
walking on its tarsus, as one side of this was ulcerated. 
The condition was apparently due to chronic inflammatory 
changes. ; 
Lobulated Liver of a Mouse, showing Cystic Spaces the 
size of Wheat Grains.—This case is very interesting, as the 
microscopic appearances suggest that the condition was due 
