16 



purposes. Each day's or each weeK's accumulations, after they are 



shoveled into the closet or pit, should 

 be sprinkled over the surface with 

 chloride of lime, and a barrel of this 

 substance can conveniently be kept 

 in the closet. If this plan be adopted 

 (and these recomrnehdations are the 

 result of practical experience), house 

 flies will have almost no chance to 

 breed, and their numbers will be so 

 greatly reduced that they will hardly 

 be noticeable. Man}^ experiments 



have been made in the treatment of manure piles in order to kill the 



Fig. 11. — (latand dog flea — enlarged (original). 



Fig. 12.— Cattle tick— enlarged (redrawn from Salmon and Stiles). 



maggots of the house fly, and the chloride-of-lime treatment has been 

 found to be the cheapest 

 and most efficacious. 



It has been stated above 

 that the closet for the re- 

 ception of manure should 

 be made tight to prevent 

 the entrance or exit of 

 flies. A window fitted 

 with a wire screen is not 

 desirable, since the cor- 

 roding chloride fumes 

 will ruin a wire screen in 

 a few days. 



Fruit flies. — While ex- 

 tend ed investigations 

 have shown that the com- 

 mon house fly is the fly Fig. IS.-Xsetse fly-enlarged (original). 



most to be feared in guarding against typhoid, on account of the fact 



