INSECTICIDE FORMULAE. 19 



The caustic soda, potash, and treacle are -dissolved 

 together in a gallon or two of water. The copper sulphate 

 and carbonate of soda are also dissolved separately, then 

 mixed. The copper sulphate is dissolved, in' a vessel 

 large enough to hold the complete (solution, and the soda 

 carbonate added slowly to it, and then the caustic soda 

 and the potash, stirring all the time. The mixture should 

 be kept mixed whilst spraying. Wooden vessels should 

 be used for copper sulphate or any of the caustic alkali 

 solutions. Iron ones are rapidly spoiled unless enamelled. 

 Great care sliould be taken not to get caustic alkali on 

 the skin, and the face and hands should be kept greased 

 with vaseline while using the sprayer. Painful burns 

 result if the spray is allowed to dry on. 



Uses. — Same purposes as No. 1. 



Time to Apply. — Winter only. 



SPRING AND SUMMER WASHES. 



9. Lime and Salt Wash. — A wash highly recom- 

 mended l)y many experts: 



Lime 1 to 1^ cwt. 



Salt 30 to 401b. 



Water lOOgal. 



Fii-st slake fresh Ihne and mix it with 50 gallons of 

 water, and in the remaining 50 gallons dissolve the salt ; 

 then mix the two. Some authorities recommend the addi- 

 tion of I to lib. of waterglass (sodium silicate), but it 

 appears this is not essential. The mixture requires to be 

 strained through a very fine sieve before using. 



Uses. — For cleansing trees of moss, lichen, and alga?, 

 and destroying the ova of the Apple Sucker (Psylla), Plum 

 Aphis, Mussel Scale, etc. 



Time to Apply.— From the end of February to 

 the beginning of April. Must not be used after the 

 buds open. 



c 2 



