16 MOSQUITOES 



driven between the meshes, the heads coming flush with 

 the surface of the screen. All the pins were connected 

 together electrically, the whole forming one electrode of 

 the secondary coil of an induction coil, while the wire 

 screen formed the other electrode. An alternating cur- 

 rent of high potential was then passed and when the 

 note was sounded the insects precipitated themselves 

 against the screen and Avere immediately electrocuted. 

 Mr. AVeaver, unfortunately, does not state whether males 

 only were captured in this wa}^ His letter was an 

 extremely interesting one, and surely his sticky fly-paper 

 experiment suggests that further exi^erimentation in this 

 direction would be worth while. 



Apropos to the difference in the musical note of differ- 

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

 will be pointed out in our consideration of the malaria- 

 bearing mosquitoes of the genus Anopheles, the sound 

 made by the female Anopheles is distinctly lower in 

 pitch than that made by the less harmfid mosquitoes of 

 the genus Culex. An interesting parallel to this is the 

 fact that the villain in the play has usually a bass voice ! 



How Far do Mosquitoes Fly? Are They Carried by 



Winds? 



A very important point to be considered by persons 

 who are engaged in extermination work against mosqui- 

 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 



