No.408.[] EFFECT OF HEAT UPON GROWTH. 953 
measurements of Bufo at the highest temperature; in this 
latter case ¢hree were taken. 
Results. —'The results are embodied in the accompanying 
tables and in the curves (Figs. 1-6) constructed from them. 
Milligrammes 
30 poe, ae 
or N PNG Z| 
#0 Pd V^ xs Lo 
y Aae sw n 
: = 
15 / //2.12*-48* Ra eit 
AL Le 
do pum. eee 
10 E P” 
5 
0 5 I5 90 en 390 35 40 45 50 565 500 68 70 
Days 
Fic. 3.— Amblystoma. Graphic representation of Table IT, column 4, showing average 
total weight on successive days of the experiment. 
40 \ 
aU 
25 x i pee 
wy 
vM N i am 
15 
8| 20-24 
t 
i 
0 ő Jé 315 20 35 W 38 40 45b BO 4 9" € 70 
Fic. 4.— Amblystoma. Graphic representation of the ratio of dry substance to the 
total weight. (See Table II, column 7. 
The column headed * No. of Days " indicates the number of 
days reckoned from the beginning of the experiment, — not 
from hatching. The exact date of fertilization is unknown. 
In Table I it will be seen that there are two sets of observations 
