ON THE HEART OF THE DOG. 
159 
May 30, 1882.—Weight of Dog, 9555 grms. Weight of heart, 81‘5 grms. 
Thermometer in the inflow tube. 
Observations. 
Temp. C. 
Beats in 
30 seconds. 
Arterial 
pressure. 
Millims. of 
mercury. 
Venous 
pressure. 
Centims. of 
blood. 
Outflow in 
30 seconds. 
Cub. centims. 
Outflow in 
1 beat. 
Cub. centims. 
1 
37 
98 
121 
59 
905 
9-23 
2 
37- 
102 
124 
59 
950 
9-31 
3 
34-25 
88 
123 
59 
875 
994 
4 
34- 
80-5 
122 
59 
830 
10-31 
5 
30 + 
65 
123-5 
59 
780 
12-00 
6 
49-5 
121 
59 
670 
13-53 
7 
45-75 
122 
59 
670 
14-64 
8 
26-25 
35-75 
116-5 
59 
583 
16-30 
9 
32-75 
116-5 
59 
525 
16-03 
10 
36-5 
116-5 
59 
590 
16-16 
11 
46 
118 
59 
643 
13-98 
12 
56-25 
119 
59 
663 
11-79 
13 
35- 
68 
120-5 
59 
710 
10-44 
14 
37 
78-5 
120 
59 
730 
9-30 
From a consideration of these tables there can be no doubt of the general fact that 
a diminution of pulse-rate, brought about by lowering the temperature of the blood 
flowing into the heart, causes an increase in the quantity of blood thrown out from the 
ventricle at each systole, and consequently an increase in the work done at each systole ; 
and vice versd. 
The changes in the outflow from the ventricle at each systole are not, however, 
inversely proportional to the changes in the pulse-rate, so that the total outflow, 
and, therefore, the total work during any given period of time, decreases with a 
diminished pulse-rate, and increases with an increased pulse-rate. 
Whether any definite relation, beyond the general one given above, can be 
established between the pulse-rate and the outflow at each systole, we are not as yet 
prepared to say ; a consideration of this and of some other interesting points which 
suggest themselves in this connexion must be left for a future paper. 
In conclusion, we desire to express our most earnest thanks to Professor Martin 
for the aid and encouragement which he has given us during the progress of this 
work. We are indebted to him not only for many valuable suggestions in the earlier 
part of the investigation, when success seemed doubtful, but also for personal 
assistance which he has sometimes kindly given. The Plate representing the apparatus 
employed is that which was published with his paper, and it is here reproduced for 
the convenience of the reader. 
