MR. NEWPORT ON THE TEMPERATURE OF INSECTS. 
313 
Table VIII. 
A Table exhibiting the Temperature, Pulsation, Weight, &c. of the Larva of Sphinx 
ligustri during its last or adult period, and their gradual and coincident dimi- 
nution after the ninth and tenth days of that period. 
No. of Exp. 
Species. 
Period of 
Observation. 
Atmo- 
sphere. 
Insect. 
Difference. 
Pulsation. 1 
Weight 
in 
Grains. 
a> % 
O CtJ 
Increase 
in Grains. 
Age. 
Remarks. 
1834. 
h , 
1 
Sphinx ligustri (larva) ... 
July 30. a.m. 
8 
70 
J J ust entered its fifth and last 
( skin. 
2 
Sphinx ligustri (larva) ... 
P.M. 
4 
74-6 
75-5 
•9 
151 
J Quiet; has voided no faeces for 
3 
Sphinx ligustri (larva) ... 
31. P.M. 
4 
19-9 
0 
4*8 
\ 10) hours. 
4 
Sphinx ligustri (larva) ... 
Aug. 1. P.M. 
4 
27-4 
7-5 
3 da"* 
TT , 
5 
Sphinx ligustri (larva) ... 
2. P.M. 
7 
73-8 
•2 
•4 
41-3 
6-5 
13-9 
4 days 
Sleeping. 
6 
Sphinx ligustri (larva) ... 
3. P.M. 
4 15 
72-4 
73-4 
1- 
50 
56-6 
8-6 
15-3 
5 days 
Quiet. 
7 
Sphinx ligustri (larva) ... 
4. P.M. 
5 
71-9 
72-9 
1* 
50 
69-1 
19 
13-5 
6 days 
Quiet, but not feeding. 
8 
Sphinx ligustri (larva) ... 
P.M. 
5 45 
72-5 
73-8 
1-3 
56 
71-5 
9 
Sphinx ligustri (larva) ... 
5. A.M. 
9 
71-3 
72-6 
1*3 
51 
77-5 
1 1-4 
6 
7 days 
Aroused and beginning to feed. 
10 
Sphinx ligustri (larva) ... 
P.M. 
8 30 
69-9 
711 
1-2 
51 
85 
10-8 
7-5 
Just aroused. 
11 
Sphinx ligustri (larva) ... 
6. A.M. 
7 30 
711 
72-3 
1-2 
50 
90-5 
16-9 
5-5 
8 days 
Aroused; beginning to feed. 
12 
Sphinx ligustri (larva) ... 
P.M. 
5 30 
70 
71-2 
1-2 
47 
93 
12-5 
3-5 
Feeding. 
13 
Sphinx ligustri (larva) ... 
7. A.M. 
6 
68-3 
68-7 
•4 
36 
98-8 
14 
5-8 
9 days 
Sleeping. 
14 
Sphinx ligustri (larva) ... 
A.M. 
6 15 
68-4 
69-3 
•9 
42 
98-8 
15 
Sphinx ligustri (larva) ... 
P.M. 
4 30 
69-2 
70-3 
11 
43 
100-1 
12-6 
1-3 
Quiet ; feeding. 
16 
Sphinx ligustri (larva) ... 
8. P.M. 
3 30 
72 
72-9 
•9 
42 
92-1 
23 
10 days 
f Very active ; discoloured ; re- 
fuses food. 
17 
Sphinx ligustri (larva) ... 
P.M. 
5 30 
71-3 
721 
•8 
40 
91-9 
J Active ; more discoloured ; 
18 
Sphinx ligustri (larva) ... 
P.M. 
6 30 
71*5 
72-3 
•8 
40 
91-7 
1 pulse laborious. 
19 
Sphinx ligustri (larva) ... 
P.M. 
7 30 
70-4 
71-4 
1* 
40 
91-5 
[Much excited; fasting; no 
( faeces passed. 
20 
Sphinx ligustri (larva) ... 
p.m. 10 30 
68-3 
69-1 
•8 
37 
90 
•9 
j Active ; more discoloured ; 
21 
Sphinx ligustri (larva) ... 
9. A.M. 
7 30 
67-4 
67-8 
•4 
24 
88-7 
11 days 
1 voided soft discoloured faeces. 
Has slept during several hours. 
22 
Sphinx ligustri (larva) ... 
A.M. 
7 45 
68-5 
69-1 
•6 
28 
88-6 
/ Awaking; temperature of air 
1 rising rapidly. 
23 
Sphinx ligustri (larva) ... 
P.M. 
11 30 
68-3 
68-8 
•5 
29 
80-3 
fin incessant action; about to 
f enter the earth. 
This difference in the velocity of the circulation at certain periods is an important 
circumstance as connected with the present subject, — the relation of the velocity of 
circulation to the temperature and respiration of the insect. For the purpose of 
ascertaining the rate of pulsation at different periods of the larva state with precision, 
I selected a healthy specimen of Sphinx ligustri, and commenced my observations 
upon it exactly seventy hours after it had left the ovum. At the moment of leaving 
the ovum it weighed only one eightieth part of a grain, but I was accidentally pre- 
vented from watching the rate of pulsation at that time. This individual was kept 
apart from other specimens from the moment it escaped from the egg until it changed 
into the pupa state. During this time, its weight, faecal expenditure, rate of increase 
from the making of one observation to the making of another, were all carefully 
noted, as well as the velocity of the circulation at different periods of its growth. 
Unfortunately, however, I was then without my thermometers, which prevented me 
from observing the temperature of the insect, and thereby completing the exami- 
nations. From these observations it appeared that the rate of pulsation is greatest 
