950 THE AMERICAN NATURALIST. [Vor. XXXIV. 
TABLE I. — RANA SYLVESTRIS. 
1. TEMPERATURE 6°-8° C. 
Av. Wt. Average Per cent 
T No. of | Length. AOPE Dry rh of Dr. 
Days. mm. SM Substance. Water to Whole 
€ mg. eight 
March 231.. — — 3.98 I.50 2.48 37-5 
E 5- 13 5 4-46 1.49 2.97 334 
8. 16 6 5.04 I.58 3.46 11,4 
"S CLE I9 7.5 6.12 1.64 4.48 26.8 
"16. 24 IO 8.26 1.58 6.68 19.1 
uw c 39. 27. IO 9.50 1.54 7.96 16.2 
"oas. 30 10.7 10.12 1.50 8.62 14.8 
AE 0 35 II.2 I3.30 1.44 11.86 10.9 
UE g 37 12 12.70 I.40 II.30 II 
May 3. 4I 17.2 19.10 1.44 17.66 7.5 
" yi 43 12.2 19.38 1.44 17.94 7-4 
urs LA 50 13.5 21.02 1.52 19.50 7:2 
2. TEMPERATURE 1i2— 15^ C 
March ig : n — 3-98 1.50 2.48 37.5 
" oag 6 7 6.66 1.62 5.04 24.3 
p n 7 8 7.06 1.50 5.56 21 
April 1. 9 10.5 10.49 I.51 8.98 14-3 
" AV. op Xe 12.5 18.32 1.46 16.86 8 
^ 5. 14 13.5 22.60 1.30 21.30 5.7 
z 8. 16 14-5 28.18 1.78 26.40 6 
wet er 20 16 36.30 1.70 34-60 47 
TOU NETS 24 16.5 37-96 1.82 36.14 47 
wir ae 28 17 39.82 1.98 37-84 44 
Nt. 3o 17 33-50 1.76 31-74 5.2 
3. TEMPERATURE 22° 25° C. 
Marth 4344.3 | — 3.98 1.50 2.48 37.5 
c aas 2 II 5. 1.30 3.99 24.6 
T m 6 19 18.01 1.18 16.83 6.5 
Api 1.... 9 — 24.56 1.25 23-31 ger 
4, INDIVIDUALS OF SAME d TAKEN FROM 2 (SEE “‘ MARCH » di — AND 
PLACED IN 3, AFTER THEY HAD BEEN IN AQUARIUM 7 DA 
March 30. . 7 8 7.06 1.50 n 2 
s M 8 II 10.28 1.32 8.86 12.8 
Api r.: 9 13 17.10 1.30 15.60 8.8 
H 4- 12 14 25.23 1.43 24.80 5:7 
M 6. 14 14.5 35.62 1.42 34.10 4 
« 8. 16 14.5 36.02 1.41 34-61 39 
"o 20 14.5 32-16 1.35 30.81 42 
! Weight of embryo free of albumen, 
at beginning of experiment, several days before hatching. 
