LEE'S INSECT POWDER HAMMOND'S COPPER SOLUTION. 31 



being breathed, cau.se arsenic poisoning; also, as in the case of Rough 

 on Rats, the arsenic might under certain conditions be converted to 

 arsine. 



LEE'S INSECT POWDER. 



[Serial No. 22292.] 



Composition of Lee's Insect Powder. 



Per cent. 



Sulphur 47. 93 



Arsenious oxid 5. 00 



Remainder appears to be tobacco and pyrethrum. 



This is another compound which may be effective in killing and 

 driving away fleas, lice, croton bugs, etc., but as to the advisability of 

 using it around human habitations the same may be said of it that has 

 been said of Royal Roach Powder. 



DRY BORDEAUX MIXTURE. 

 [Serial No. 19531.] 



Composition of Dry Bordeaux Mixture. 



Per cent. 



Sand 0. 41 



Carbon 1. 05 



Carbon dioxid 3. 55 



Copper oxid 15. 46 



Sulphur trioxid 15. 00 



Calcium oxid 30. 12 



Magnesium oxid 17. 52 



Water of constitution, crystallization, and hygroscopic 



(by difference) 16. 89 



100. 00 



This sample was originally prepared by using approximately equal 

 portions of CuSO 4 5H 2 O and unslaked lime. The reasons why such a 

 compound can hardly be successful have already been stated (p. 27). 



HAMMOND'S COPPER SOLUTION. 

 [Serial No. 19688.] 



Composition of Hammond's Copper Solution. 



Grams. 



Ammonium hydroxid, per 100 cc 32. 9060 



Copper oxid, per 100 cc 5. 5657 



Sulphur trioxid, per 100 cc 1. 1397 



A considerable amount of carbon dioxid is also present. This solu- 

 tion was evidently made from strong ammonia, copper sulphate, and 

 copper carbonate. The value of a mixture of this kind as a fungicide 

 is well known and requires no further discussion. 



a See correspondence with manufacturers, page 61, 



