BORDEAUX MIXTURE NORTH STATE INSECTICIDE. 27 



cent, along with about 13 per cent calcium arsenite, 12.53 per cent 

 copper oxid, and small amounts of other substances. It is of value as 

 an insecticide as far as its 13 per cent of calcium arsenite is concerned. 

 As to the copper, this seems to be present entirely as copper oxid. A 

 full discussion of why copper in this condition can be of little or 

 no value as a fungicide is given in Farmers' Bulletin 146 of this 

 Department. 



BORDEAUX MIXTURE AND PARIS GREEN. 



[Serial No. 1%75.] 



Composition of Bordeaux Mixture and Paris Green. 



Per cent. 



Carbon , 0. 96 



Sand 0. 41 



Arsenious oxid 25. 86 



Sulphur trioxid 6. 78 



Carbon dioxid 9. 48 



Acetic acid 3. 34 



Copper oxid 16. 93 



Calcium oxid 24. 00 



Magnesium oxid 1. 90 



Water of crystallization, composition, and hygroscopic 



( by difference) 10. 34 



100.00 



Arsenious oxid by water extraction (5. S<> 



Copper oxid by water extraction 0. 40 



This compound consists of a mixture of about 40 por cent Paris 

 Green and 00 per cent of the ingredients used in making Bordeaux 

 Mixture. a 



The 6.86 per cent of soluble arsenious oxid at once condemns this 

 compound for all spraying purposes. 



Noiri'H .STATE INSECTICIDE. 



[Serial No. 22291.] 



Composition of Norti '/ Mat,' liiwtidil,; 



Percent. 



Insoluble in hydrochloric acid 24. 91 



Copper oxid 12. 43 



Ferric oxid and alumina 13. 98 



Calcium oxid 9. 07 



ArsenioiiH oxid 20. 32 



Sulphur trioxid ...'. 12. 95 



Acetic acid and water ( by difference) 6. 34 



100.00 



This compound is of value as an insecticide as far as its content of 

 Paris Green, amounting to about 36 per cent, is concerned. The 

 remainder, consisting of calcium sulphate, sand, ferric oxid. and 

 alumina, is inert in its action on insects. 



For a discussion of the causes why Dry Bordeaux Mixture thus prepared can in 

 all likelihood never be a success, sec Fanners' Bulletin No. 14(1, of this Department. 



