100 



APPENDIX 



bottle. 



requisite. A quinine bottle answers admirably (Fig. 4). 

 A straight vial .without a shoulder is convenient to carry 

 in the vest pocket. In the bottom of the quinine bottle, 

 put about a teaspoonful of cyanide of potas- 

 sium (poisonous). Usually this material is 

 in lumps. Pulverize, pour it into the bottle, 

 and pack it down evenly with the flat end 

 of a lead pencil. Pour on top of it enough 

 dry plaster of Paris to cover it from J to f 

 of an inch in depth. Pour just enough 

 water a few drops at a time on the 

 plaster to make it set on top. It can be 

 smoothed and packed with a lead pencil. 



-^ o no ^ we ^ ^ ne pl as ^ er a ll the way to the 

 cyanide, else the cyanide will dissolve and 

 make the bottle very moist and sticky, thus ruining the 

 insects. If the bottle is too moist, put in circles of 

 blotting paper. Leave the newly made bottle open over 

 night, so that it will dry out. Then cork, and it is ready 

 for use. If care is exercised to keep the bottle corked, it 

 will last a whole season. 



Another method of making a killing bottle is to pour 

 \ inch of dry sawdust over the cyanide and force a circle 

 of thick blotting paper into the bottle to hold the sawdust 

 and cyanide in place. The circle of paper should be slightly 

 larger than the inside of the bottle, that it may fit tightly. 

 With this method the bottle may be used again and the 

 cyanide renewed when it has lost its strength. Moreover, 

 the bottle is much lighter than if plaster of Paris is used. 

 Such a bottle has a disadvantage from the liability of the 

 blotting paper to work loose and allow the sawdust and 

 cyanide to mix up with the insects. The bottle should be 



