THE INFLUENCE OF SECONDARY RESISTANCE 83 
periments of this series, ten in all, the secondary re- 
sistances ranged from 2800 ohms to 6000 ohms, averag- 
ing 3900 ohms. The values of A ranged from 4300 to 
14,000, averaging 7800. The statistics for this series 
are given in Table IX. 
TABLE IX 
Illustrating the Tendency of ft and Z to vary similarly in Direc- 
tion and Extent. Z represents the Stimulus producing Just 
Perceptible Wrist Extension in Cat. Stimulus applied to 
Deep Branch of Radial Nerve 
Date, 1910. 
Secondary 
resistance. 
Value of A. 
Value 
ofZ. 
Value 
of/3. 
Ratio 
ft 
z' 
Aug. 8 
6000 
7"?OO 
2 77 
I "?4 
<;6 
Tulv 28. . 
44QO 
tJOOO 
2 , IQ 
i 7 
C2 
Aug. "\. . 
4800 
8000 
3.84 
2 -4 
62 
AUJ? 3 
24.00 
7800 
432 
30 
7O 
Auer. Q 
3000 
0800 
r ij2 
4 22 
77 
Aug. 2 
4600 
yow 
OOOO 
6 O< 
4 08 
68 
Aug. 17. . 
2800 
4600 
2S.4 
15.8 
.62 
As Above except that Stimulus was applied to Tibial Nerve, and 
Reflex Flexion of Hind Leg was Movement Evoked 
July 18. . 
3000 
4,300 
4 08 
2 4 
. ^O 
T 1 
TulV 22 
4OOO 
14 ooo 
6 6 
SI 
77 
4 * y 
lulv 20. 
3OOO 
7,000 
24 7 
17 3 
7O 
Average 
6<c 
Inspection of the table reveals a definite tendency of 
/3 to vary as does Z. The closeness of this tendency is 
brought out more strikingly, however, in Fig. 17, in 
