Relation of Cortex to Volume. 
535 
Table VII. 
Entire 
area. 
Medulla. 
Cortex. 
Per cent, 
of cortex. 
Average 
per cent. 
Volume of 
kidneys. 
L 
.065 
.027 
.038 
.584 
R 
L 
Cat 1. 
18 
15 
L 
.067 
.027 
.040 
.597 
.590 
L 
T 
L* 
.088 
.036 
.052 
.590 
R 
L 
T 
.041 
.006 
.035 
.853 
16 
15 
Cat 2. 
L 
T 
T 
.022 
.009 
.013 
.590 
T 
.038 
.012 
.026 
.684 
.679 
L* 
.055 
.026 
.029 
.527 
R 
L 
T 
.025 
.007 
.018 
.720 
8.5 
9 
L 
T 
Cat 3.. .. 
T 
.013 
.001 
.012 
.923 
T* 
.025 
.010 
.015 
.600 
T 
.032 
.008 
.024 
.750 
.704 
L* 
.094 
.032 
.062 
.652 
R 
L 
L 
.086 
.036 
.050 
.581 
19.5 
18 5 
T 
L 
Cat 4. ... 
T* 
.035 
.017 
.018 
.514 
T 
.042 
.018 
'.024 
.571 
T 
.030 
.011 
.019 
.633 
.591 
Average per cent, of cortex. 
.641 
15.5 
14.4 
ESTIMATION OF THE NUMBER OF GLOMERULI IN THE CAT’S KIDNEY. 
The only estimation to which we had access, regarding the 
number of glomeruli in any kidney, was that of Schweigger-Sei- 
del. 1 In his investigation he first tried to estimate the number 
of glomeruli by observing the number of tubes which opened at 
the papilla of the kidney, cutting sections farther up and seeing 
how many branches of collecting tubules were given off, and 
finally making an estimate of the number of tubules which 
joined these collecting tubules in the medullary ray. 
1 Die Nieren des Menschen und der Saugethiere id ihrem feineren 
Baue: Halle, 1865. pp. 48-52. 
