REMEDIES. 179 



prove of considerable interest and value. In 

 preparing these lists, efforts should be made 

 to observe the habits of the insect and to 

 obtain all the stages from the egg to the mature 

 insect. 



4. Insects, required as specimens, are best 

 killed by putting them into a 'killing bottle/ 

 This is a wide- mouthed stoppered bottle in 

 which some fragments of cyanide of potassium 

 have been placed, and some plaster of Paris, 

 mixed with water to the consistency of thick 

 cream, poured over the cyanide so as to cover 

 it completely. When the plaster has set the 

 bottle is ready for use, and any insect placed 

 in it is quickly killed. Owing to the extremely 

 poisonous nature of potassium cyanide, it 

 is desirable that these killing bottles should be 

 purchased ready for use. When the bottles 

 are old and exhausted care should be taken in 

 disposing of them so as to avoid injury to 

 persons or animals by any remaining cyanide. 

 It is impossible to be too careful in this respect. 



KEMKDIE8. 



Two very generally useful mixtures for 

 spraying plants with are : 



. (1.) Kerosene emulsion, made by dissolv- 

 ing half a pound of hard soap in one gallon 



