214 MOSQUITOES 



bedroom at night one of these stick-cups was given to me 

 with a description of how it was to be used. I was too 

 sleepy to experiment, however, and went to bed. On 

 wakening the next morning I thought of the experiment 

 and tested it with great success. Eighteen mosquitoes 

 were caught on the ceiling of the bedroom, but as every 

 one of tlunn was full of IJood, I regretted that the use of 

 the instrunKMit had come as an after-thought. 



Celli and Casagrandi state that the substance which 

 they call Larja^ith III, which (if I am correct in suppos- 

 ing it to be a misprint for " larvicide ") is dinitrocresol 

 — a yellow aniline color — will when burned in small quan- 

 tities, kill the adult mosquitoes, and that this method con- 

 stitutes the most efficacious method of destroying them. 

 TIk; (^hinese use pine or juniper sawdust, mixed with a 

 small quantity of brimstone and an ounce of arsenic, run 

 into slender bags in a dry state. Each bag is coiled like 

 a snake and tied with thread. The outer end is lighted. 

 Two coils are said to be sufficient for an ordinary room, 

 and 100 coils sell for six cents. 



There have been many substances recommended for 

 use upon the skin in order to discourage moscpiitoes. 

 Camphor, rubbed upon the face and hands, or a few drops 

 upon th<^ pillow at night, will keep away mosquitoes for 

 a time, and this is also a well-known propert}' of oil of 

 pennyroyal. The use of oil of peppermint, lemon juice, 

 and vinegar have all l)een recommended for use as pro- 

 tectors against mosquitoes, while oil of tar is also used 

 in bad mosquito localities. Dr. John B. Smith writes 

 that in the matter of i)r('ventives, in his experience noth- 



