ILLUSTRATIONS 
The house fly—Disease carrier . . . Frontispiece 
FIG. PAGE 
1. Eggs, approximately natural size; photographed 
on surface of manure pile (from New- 
stead). facing 18 
2. Eggs, approximately natural size (from New¬ 
stead) . facing 18 
3. Eggs, greatly enlarged (from Newstead) facing 20 
4. Eggs, greatly enlarged—another view (from 
Newstead). facing 20 
5. Egg of house fly; greatly enlarged .... 19 
6. Egg hatching; greatly enlarged . . facing 22 
7. Full grown larva of house fly; greatly en¬ 
larged . facing 22 
8. Larvae in horse manure(from Newstead) facing 24 
9. Larvae and puparia (from Newstead) . facing 24 
10. Puparia on a bit of old rotting cloth from an 
ash barrel (from Newstead) . . facing 26 
11. House fly puparium and pupa; greatly enlarged 24 
12. Adult house fly from above; greatly en¬ 
larged . facing 28 
13. Adult house fly from below; greatly en¬ 
larged . facing 28 
14. Head of adult house fly; greatly enlarged facing 30 
15. Head of adult house fly from side; greatly en¬ 
larged . facing 30 
ix 
