WILLIAMS: HABITS OF SCUTIGERELLA. 
471 
Table 1 . Continued. 
Days 
Initial 
no. of 
animals 
1-5 
5-10 
10-15 
15-20 
20-25 
25-30 
30-35 
35-40 
40-45 
45-50 
No. 3. 
Soil had been in lab¬ 
oratory for two 
years. Had been 
used for Scuti¬ 
gerella the pre¬ 
vious year. 
11 
11 
11 
11 
11 
11 
10 
8 
4 
3 
2 
No. 4- 
Like no. 3. 
7 
7 
7 
7 
7 
5 
5 
5 
4 
2 
record 
No. 5. 
Common loam from 
out-doors. 
8 
8 
8 
6 
6 
6 
4 
reeor 
dstop 
s 
ped 
topped 
No. 6. 
Baked soil and com¬ 
mon soil mixed. 
11 
4 
3 
3 
2 
2 
2 
2 
2 
none 
No. 7. 
Common soil kept 
rather wet. 
8 
7 
7 
7 
7 
6 
6 
6 
6 
6 
3 
No. 8. 
Common soil like 
no. 5. 
12 
12 
12 
12 
12 
12 
12 
9 
8 
4 
3 
No. 9. 
Baked soil like 
no. 2. 
8 
4 
4 
2 
1 
1 
1 
none 
This table may indicate, however, that none of the dishes contained 
any food for Scutigerella and that at the end of 50 days most of the 
individuals had starved to death in each dish. 
In dish no. 1, a specimen survived for 112 days. The table indicates 
without a doubt that those dishes in which the soil was either wholly 
(nos. 2 and 9) or partially (no. 6) sterilized were more unfavorable 
for the animals than the unsterilized soils. At the end of 15 days 
but three animals had died out of 58 individuals in the other six dishes, 
while 19 out of 28 individuals had died in the three dishes sterilized 
wholly or in part. Moreover, all the 28 animals died by the fortieth 
day while those of the other dishes whose record was kept, still con¬ 
tained some Scutigerellas at the end of 50 days. 
Those animals in dishes with little organic matter soon became 
very translucent and the mid-gut appeared dark, due to the amount 
of earth introduced into the intestine. 
The animals survive much better if instead of a thin layer of earth 
the bottom of the dish contains moist leaves. For the sake of keeping 
