134 ELIZABETH HOPKINS DUNN 
TABLE 1 
Records from measurements on the ten largest nerve fibers in the ventral roots of the 
second cervical nerve in a number of albino rats 
TEN LARGEST FIBERS 
THEIR AXIS- 
eC | 22 | CYLINDERS Bo 
a | Ss | Ba | A A | Aver- | og 
| 2 = & | .Average | verage ver- | Pt 
Belcan 1) (8 S| BF | diameter | “sa jase de| Amos | 3 
| Grams ORs | | : : 
TAC i 7 | Female | 8.25 | 368 4.60 UGG I Ba | 10.18 rh Bales} 
AC.) | Henvale 8.93 368 4.75 UO) | Bers |) Mal wo 1 62; 
AM .| 7 | Male | 8.90 | 372 5.05 19.95 4.05 | 12.82 1b Sika fais) 
Ae 7 | Male | F754) 1360 5.60 24.63 | 4.55 15.07 1S als (ahs 
A...| 14 | Female} 19.98 | 518| 7.05 | 38.93 |4.85) 18.40 | 1:2.06 
185 5 ih re} Female | ZAKS ue 0G 6.95 38 .04 4.75 719) leet: 
A | 14S Viale 20.73 | 536 6.60 34.13 | 4.50 | 15.90 1B OAL 
14 | Male | 21.98 | 594 6.35 31.59 4.30 14.52 Lov 2ale 
iC 36 | Female | 39.17 | 651 9.35 68.81 5.80 | 26.42 1 227388 
(6 36 Female | 45.30 | 654 10.55 87.58 (S745) |) Stay) 1 :2.44 
C 36 Male 31.20 | 536}. 10.36 84.30 6.50 | 33), 18) 1S) 
@ 36 Male 52.65 689 | 9.90 76.98 6.20 30.19 ee 4 5) 
IDES si 753 Female 130.31 505 | 12.15 Sate 7.90 | 49.01 13 sata) 
Diaieto Female | 143.10 | 615 12.10 114.99 8.00 | 50.26 ly etze29 
D 75 | Male 149.40 | 609 122 5115) 116.13 8.20 | 52.81 e220) 
E 74 | Male | 189.70 | 726 12825 117.67 8.20 | 52.81 19.93.98) 
lee gl) ies} | Female | 161.00 | 634 | 12.70 126.68 8.25 | 53.58 1218 
G...| 183 | Female | 167.51 | 731 13.60 145 .27 9.10) 65.03 22 
AY 2a 1Sss Male 260 .00 | 680 13.16 133 .96 | 8.84 61.37 IPF ils) 
H...| 132 | Male 274.00 | 569 13.70 148.04 | 9.10 | 65.03 UA 7; 
L250\ 280, Female 200.00 | 510 | 14.55 166.50 9.80 75.43 Li 2e20 
J...| 180 | Female | 225.00 526 14.75 IAL ill 9.85 76.36 15 See 
K...| 180 | Male 227 .60 | 546 15.45 187 .23 10.65 88.91 1h 9274140 
L...| 180 | Male 302.00 | 6627) 16750 215.38 11 MOWIO ol 1 :2.00 
M ..| 270 Female | 165.85 | 698] 18.20 | 260.16 13.10 | 134.78 1:1.94 
Vie 270, Female 187.96 | 853 18.25) ZolcSr Wil2s05 | 131-92 L298 
M ..| 270 Male 330.68 | 576| 16.25 | 207.65 /11.30 | 100.28 3/206 
M..| 270 | Male 349.41 658 16.95 | 225.91 {12.05 | 113'.85 1 1.98 
| | | | 5 
N!..;Aged| Male | 210.00 | 901 | 14.85 | 173.43 |10.50| 86.59 ee 
©O!..|Aged| Male | 379.40 934 15.00 | 176.69 |10.00 | 78 . 54 L 22.25 
P! ..|;Aged| Male | 414.00 758 | 14.35 | 161.96 9.40 | 69.40 ae 
1 These aged rats were about 640 days old. 
1907. 
They were killed in 1903, 1904 and 
