CONTRACTIONS OF AMPHIBIAN MUSCLE 
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— 3°C. and the third between 34° C. and 42° C. The two-maxima 
class produced the first maxima between 10° C. and ■ — 3°C. and 
the second, after going through the second period in a rather 
symmetrical curve, appears in the third period from 36° C. to 
42° C. The range of minimum temperature with the three-maxima 
was — 6°C. to — 2°C. for the first one, 12°C. to 30°C. for the 
second and 40° C. to 48° C. for the third. With the two-maxima 
records the first minimum was from — 5°C. to -hl4°C. and the 
second 42° C. to 46° C. (Table I). 
Fig. S3. Mean Curves of All Experiments and of Those Which Recorded at All 
Temperatures. 
A-A' represents a mean curve of all muscle records and each temperature is plotted. 
B-B' represents a mean curve of all muscle records which recorded at all ranges 
of temperature and each temperature is plotted. 
To obtain a better conception of how the results of the twenty 
experiments compared, several curves were made and are sub- 
joined below; one of all the records when averaged, (Fig. 53, 
A-A^) ; one showing the average of those recorded at- all ranges 
of temperatures (seven) (Fig. 53, B-B') ; average of all three- 
maxima contractions (Fig. 54, 11-11) ; average of all two- 
maxima contractions (Fig. 54, 9-9) ; a typical three-maxima 
curve (Fig. 55,' 10-10) ; and a typical two-maxima curve (Fig. 
55, 22-22). It will be seen from the curve of all the records 
from the muscles (A-A'') that three maxima appear, the first 
one at — 2°C., the second at — 2°C. and the third at 38° C. Rigor 
caloris began at 44° C. The curve of those registering at all 
temperatures (seven in number) is of the two-maxima type, the 
first at — 2°C., the second at 36° C. -Rigor caloris began at 
