254 
DR. A. D. WALLER AND MR. E. W. REID ON THE 
Table I.— Abstract of Galvanometer Experiments—(continued). 
Experi¬ 
ment. 
Date. 
Animal. 
P.M. 
Spon¬ 
taneous 
beats. 
Apex 
excitation. 
Base 
excitation. 
Demarca¬ 
tion. 
Time p.si. of 
registered 
demarcation. 
1886 
29 
Feb. 12 . 
Dog . . 
6' 
SN 
NS 
s 
8' 
S»S 
30 
Feb. 13 . 
Cat . 
38'—47' 
, , 
NS 
SN 
31 
Feb. 15 . 
Dog . . 
SN 
NS & N 
SN 
32 
Feb. 18 . 
Dog. . 
20' 
N & NS 
N 40' p.m. 
, . 
S 
33 
Feb. 22 . 
Cat . 
S LV 
N 
SN 
s 
, . 
N RV 
NS 
SN 
34 
Feb. 25 . 
Guinea- 
. . 
NS 
SNS 
N-016 d 
35 
Feb. 26 . 
Pig 
Cat . 
s 
N 
36 
Feb. 27 . 
Rabbit . 
io' 
S 
S 
N -0388 d 
S' 1 
0 
20' 
, , 
NS 
S 
5? 
) J 
30' 
N 
S 
Experiment 29.—The chief peculiarity in this experiment was the varying character of the spontaneous 
variation; we noted it as SN, N, NN, NS SN, and NS. 
Experiment 30.—’With lateral position of electrodes, A being on the right border and B on the left of 
L.Y., spontaneous beats gave SN. 
On the right ventricle with same disposition, the same, SN. 
Excitation near A gave NS. 
Excitation near B gave SN. 
Experiment 31. 
Eog .—Decapitated 1.10 p.m. Apex to N screw of galvanometer. 
I. Electrodes to base and apex of left ventricle. 
Spontaneous heats. SN 1.16 
Base excitation. S 
Spontaneous beats. SN 1.20 
Apex excitation.NS and N.1.25 
Base ,, . SN 
II. Electrodes laterally placed. N electrode to right border ; S to left border. 
Excitation near S electrode 
„ N „_.... 
III. Electrodes laterally placed on right ventricle. 
border. 
Excitation near S electrode .... 
IV. Electrodes to base and apex of right ventricle. 
Apex excitation . 
Spontaneous heats 
1.30 
V. Electrodes laterally placed on left ventricle 
border. 
Excitation near S electrode . 
„ N „ . . 
Spontaneous. 
Excitation near S electrode . 
Spontaneous. 
Later. 3 p.m. 
Excitation near S electrode . 
„ N „ . . 
N „ . . 
SN 
NS 
N electrode to left border; S electrode to right 
S .1.35 
N electrode to base; S electrode to apex. 
NS and N.1.47 
N 
NS .1.53 
N electrode to right border ; S electrode to left 
SN 
NS 
followed by 
NS 
SN 
followed by 
SN 
SSS 
followed by SN. 
N 
followed by NS. 
NNN 
followed by NS. 
Time, 3.15. 
Experiment 32.—We took the excitatory variation in the excised right auricle. Excitation near A gave 
NS, excitation near B gave SN. We attempted to follow the effects of local heating of base and apex, 
but without result. 
