58 INSECTICIDES. 



Boil the soap in the water, and when thoroughly dis- 

 solved and still hot add the paraffin and churn with a 

 syringe until a white creamy mixture has been obtained. 

 If the instructions are properly carried out the ingredi- 

 ents will not separate. The mixture may be set aside 

 for future use in corked bottles, or, as I prefer, used at 

 once. For bark applications add to this nine times the 

 quantity of hot soft water, and again churn with a 

 syringe until the ingredients have again amalgamated. 



The application should be made in the winter months 

 with a stiff brush, taking care to rub it well into the 

 old rough bark, and to thoroughly soak any shreds 

 which may of necessity have to be left as supports to 

 the branches of wall trees. Some prefer to use the 

 mixture while hot, say at a temperature of 130 F., In it 

 for outdoor work I have found it quite impossible to 

 maintain any given temperature. The secret of suc- 

 cess lies chiefly in a perfect emulsion, and thorough 

 application of it. 



From recent experiments conducted in a large peach- 

 house, I find this the most effectual remedy for the 

 brown peach scale (Lecanium persicae), killing about 

 80 per cent, of the larvae. 



This emulsion may also be used for spraying foliage 

 for other as well as scale insects. For tender plants, 

 and unripe wood and foliage, about double tin* <|ii;mt it y 

 of water should be added ; but even then the mixture is 

 apt to scorch. It is advisable, therefore, to test the 

 effect of the emulsion on the foliage before making 

 wholesale applications of it, as it may be found neces- 

 sary to considerably weaken it by the application of 

 water. It should be borne in mind that a certain per- 

 centage of soap, paraffin, and water is more deadly in 

 its effects upon plants than pure paraffin a fact 

 abundantly proved in the experiments conducted at 

 Woburn on the currant Phytoptus. And what is more, 

 certain plants can withstand the application more than 

 others, and it will be necessary to vary the strength of 

 the emulsion to suit them. 



