170 3I0SQVIT0ES 



ponds ill iiei^liljoriiii::: woods, and especially with the liig-h 

 brackish sea-coast marshes, that the expense would be- 

 come very great. 



The consideration of tln^ question of remedies may 

 most conveniently be divided into the following;- main 

 cate.ijfories : (1) llemedial work against tlie early stages ; 

 (2) liemedial work ag-ainst the adults. 



llemedial Work Apfainst the Early Stages. 



In considering the (question of remedies against the 

 early stages, Ave again find it most convenient to sub- 

 divide the subject as follows : (1) The treatiiiciit of 

 breeding-places with insecticides ; (2) The abolition of 

 breeding-places by drainage, and (3) The introduction of 

 natural enemies into lireeding-pools, which for any rea- 

 son it may be undesirable to drain, or to treat with oil. 



Before undertaking work against the early stages of 

 mos({uitoes in any given neighborhood, it becomes neces- 

 sary to make a thorough survey of tlu^ immediate sui'- 

 rouiidings, and to learn with great accuracy all of the 

 places in wliicli mosquitoes are breeding or may breed. 

 In the section entitled " Queer Places in which Mosqui- 

 toes Breed " ((^hapter I.) an effort has been made to cover 

 the ground rather thoroughly as an indication of what 

 must be looked for. All accidcMital receptacles f(U' stand- 

 ing water must be enipiied and must be kejtt (Mii])ti«^d ; 

 waste ground in the vicinity must be thoroughly ex- 

 amined, in order to find wh(>ther there are hollows in 

 wliich rain-water accumulates or whether there are broken 



