FANCIER'S FRIEND ROACHSAULT. 53 



dently consists of organic matter, chlorid of iron, and ferrous sulphate, 

 which has been partially dehydrated and partially oxidized to ferric 

 sulphate. Both the chlorid of iron and ferrous sulphate present in 

 this mixture are used as fungicides in certain cases of plant disease, 

 hut they can be purchased very cheaply unmixed with worthless and 

 inert matter. 



POTASSIUM CYANIDE. 

 [Serial No. 20480.]- 



A determination of the cyanogen in this sample, calculated to potas- 

 sium cyanide, shows that only 27.60 per cent is present. The remain- 

 der appears to be composed principally of potassium carbonate with a 

 little potassium cyanate. It is needless to say that this is a very 

 impure sample of potassium cyanide. 



TAR CAMPHOR. 

 [Serial No. 20481.] 



This sample is prepared from the heavy fractions of coal tar, and 

 is almost entirely composed of naphthalene. This substance is of value 

 in driving away moths, lice, etc. , but will not kill the insects. 



FANCIER'S FRIEND. 



[Serial No. 20488.] 



Composition of Fancier's Friend. 



Per cent. 



Moisture 5. 03 



Ash 7.21 



Sulphur 30. 77 



38.01 



The remainder appears to be an imitation of pyrethrum, since it 

 contains lead and chromium as load chromate to give it a yellow color, 

 yet the ether extract does not in the slighest degree have the charac- 

 teristic odor of pyrethrum. 



ROACHSAULT. 



[Serial No. 23501.] 



Composition of RoacJisault. 



Per cent. 



Sodium fluoric! 85 



Moisture 2.53 



Alumina and ferric oxid .27 



Silica as fine sand .. 9.60 



Sodium sulphate (by difference) 2. 60 



100 



While sodium fluorid, which is the principal constituent of the above 

 mixture, has been used for quite a while as an antiseptic, we are not 

 aware that its value as an insecticide has been tested, but think that it 

 might have considerable power in this direction. 



