PLATE 1 
EXPLANATION OF FIGURES 
1 Kidney of kitten, 22 em. in length, with little abdominal or subcutaneous 
fat. Radial section of tissue fixed in Benda’s fluid shows lipoids blackened by 
osmic acid in medullary segments of proximal convoluted tubule. Photograph, 
x 24. 
3 Kidney of kitten, 19 em. in length, very fat, not yet weaned. Radial section 
of tissue fixed in Benda’s fluid shows lipoids blackened by osmic acin in labyrinth. 
Photograph, X 44. 
4 Kidney of kitten, same as figure 3. Tangential section shows labyrinth 
blackened, rays unstained. Photograph, X 44. 
5 Kidney of kitten, 23 cm. in length, fair amount of abdominal and sub- 
cutaneous fat. Radial section of tissue fixed in 10 per cent dichromate and osmie 
acid without heat shows blackened medullary segments in rays in cortex and 
ascending limbs of medullary loop in outer zone of medulla. Photograph, X 16. 
6 Kidney of kitten, same as figure 5. Radial section, same as figure 5. Pho- 
tograph, 44. 
7 Kidney of kitten, same as figure 5. Tangential section shows medullary 
segments of proximal convoluted tubule in cross-section. Photograph, x 44. 
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