ILLUSTRATIONS 



The house fly — Disease carrier . . . Frontispiece 



FIG. PAGE 



1. Eggs, approximately natural size; photographed 



on surface of manure pile (from New- 

 stead) facing i8 



2. Eggs, approximately natural size (from New- 



stead) facing i8 



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 



