SECOND CERVICAL NERVE OF THE RAT 135 
average diameter and the average area for their axis cylinders; 
and, in the final column, the ratio of the area of the axis cylinder 
to the area of the entire fiber. 
TABLE 2 
Averages for the enumerations and measurements for the groups of albino rats 
specified in table 1 
yaar, (poe? | teuascesn | anh ese 
Grams | 
7 days | | | 
Two females..... 8.59 368 lly Oa 10.59 2 1562 
Two males....... 9.33 366 22.29 13 .94 1h 2 a) (610) 
Boothe s.ct: 8.96 | 367 19.75 1227 L261 
14 days ~ | 
Two females..... 20.92 542 38.48 18.10 12g 
Two males....... 21.33 565 | 32.86 15.21 1-216 
Bother. oes 21.12 554 35.67 16.65 | 1:2.44 
36 days + | | 
Two females..... 42.24 653 | 78.19 31.16 We Dil 
wonmeleses se e| 41.93 613 | 80.64 | 31.69 em 54! 
Bothet..ce eee APSS meee e638 79.42 31.42 1 :2.53 
75 days | | | 
Two females..... 136.70 560 115.37 AQEGS a, pple 2.32 
Two males....... 169.55 668 116.90 52280) lade e272 
Bothwtste:. >| 153.13 614 LAGMAP S| 5122) 3) = 1 227 
| 
132 days | | 
Two females..... 164.26 683 135.98 59.31 | 1:22.29 
Two males....... | 267.00 625 141.00 63.20 12223 
Bou leey fattest 215.63 | 655 138 .49 61.26 1: 2.26 
| | 
180 days | 
Two females..... | 212.50 518 168.83 75.89 1 2792 
Two males....... 264.80 609 201.30 98 21 2.02 
Botha eas | 238.65 564 185.06 | 87.05 L212 
270 days 
Two females.....| 176.91 | 776 | 261.02 133.35 1 :1.96 
Two males....... 340.05 61S 216.78 107 .07 1 : 2.02 
Bath sus.eeee 258 .48 697 238.90 120.21 1 :1.99 
640 days 
Smales../-2 ge) 334.47 864 170.69 78.18 i 2519 
