224 3I0SQU1T0ES 



reading-glass four inches in diameter, witli a strong han- 

 dle, which I find very useful in examining the surface of 

 water-pools, especially for Anopheles larvae. The dip- 

 strainer used is an ordinary cheai? coffee-strainer which 

 has been mounted upon a long handle, so that one can 

 reach out two or three feet from the shore and cai:)ture 

 larvae and pup*. Other larger strainers with a fine mesh 

 are sold at the hardware stores and may be purchased 

 clieapl}^ In bringing larvae and pupte in from the field, 

 too much jarring about in a bottle may result in their 

 death by drow^ning. It is desirable, therefore, to put 

 moss or water-weed in the bottle with a minimum of 

 water, provided the insects are transferred to an aquarium 

 or a still jar wdthin a few hours. 



Nuttall, Cobbett, and Strangeways-Pigg, who have done 

 a great deal of collecting of mosquito larvae in England, 

 as shown in one of their important papers, entitled 

 '' Studies in Relation to Malaria," published in the Jour- 

 nal of Hygiene, vol. i., No. 1, January, 1901, used as their 

 collecting apparatus some wide-mouthed bottles of me- 

 dium size with cork stoppers ; a white enamelled dipper 

 which, when required, can be tied with a jDiece of twine 

 to a long bamboo rod ; a small pipette with a rubber bulb 

 and small vials containing dilute alcohol for the preser- 

 vation of larvae which they did not Avisli to keep alive. 

 They travelled over England on their collecting trips on 

 bicycles. When the larvae or eggs a\ ^re captured in the 

 l^orcelain dippers they Avere removed with a iDipette and 

 put in bottles, wdiich were half filled with water, wrapped 

 in cloths, and attached to the bicycle frame. They found 



