IG MOSQUITOES 



driven between the meshes, the heads eoiuiii^- tlush with 

 the surface of the screen. All the i)iiis wvw. connected 

 tos"ether electrically, the whole forniin"' one electrode of 

 the secondary coil of an induction coil, while the wire 

 screen formed the other electrode. An alternatinf? cur- 

 rent of hi.^h potential was then passed and when the 

 note was sounded the insects precipitated themselves 

 aii'ainst the screen and were immediately electrocuted. 

 Mr. Weaver, unfortunately, does not state whether males 

 only were captured in this way. His letter was an 

 extremely interesting one, and surely his stick}' Hy-paper 

 experiment suggests that further experimentation in this 

 direction would be worth while. 



Apropos to the difference in the musical note of diti'er- 

 ent kinds of moscpiitoes it should here be stated that, as 

 will be pointed out in our eonsideration of the malaria- 

 bearing mosquitoes of the genus Ano])lieles, the sound 

 made by the female Anopheles is distinctly lower in 

 pitch than that made by the less harmful mosquitoes of 

 the genus Culex. An interesting parallel to this is tlu^ 

 fact that the villain in the play has usually a l)ass voiee! 



How Far do Moscjuitoes Fly? Are Tlu\v Canifd ])y 



Winds? 



A very imi)ortant point to be considered by persons 

 who are engaged in externnnation work against mosipii- 

 toes is the one suggested by the heading of this section. 

 To the owner of a large estate it is most discouraging to 

 anticipate that at the close of careful remedial work, in 



