Some Spraying Mixtures. 401 



the tribe of bugs from A to Z, and it will prevent potato blight, tomato 

 rot, melon disease and strawberry-leaf blight — all of which diseases 

 are formidable in the Northern and Eastern states. Bug Death is a 

 tenacious powder, and wherever it takes hold it serves its purpose." 



W. H. MORSE, M.D., F.S.S., 



Consulting Chemist. 

 Westfield, N. J., April 25, 1898. 



It contains neither arsenic nor copper, and what its value rests upon 

 it is difficult to see, for it consists principally of zinc, lead and iron 

 oxides, in the following proportions : 



Zinc oxide 76.5 per cent. 



Lead oxide 9.8 per cent. 



Iron oxide 7.8 per cent. 



The remainder consisted of silica, chlorine, potash and a trace of 

 phosphoric acid. While it may prove useful in combating some pests, 

 there is not, I believe, any record of the use of oxides of iron, zinc or 

 lead as successful insecticides. 



The consulting chemist above mentioned claims fertilizing value for 

 Bug Death. 



A fertilizer analysis gave the following results : 



Nitrogen 00 per cent. 



Phosphoric acid 08 per cent. 



Potash 2.00 per cent. 



The average of analyses of five samples of soil of ordinary produc- 

 tivity was found to be : 



Nitrogen 21 per cent. 



Phosphoric acid 16 per cent. 



Potash 1.63 per cent. 



Inasmuch as Paris green must now contain 50 per cent, "of arsenic 

 when warranted to be pure, other arsenical compounds whose insecti- 

 cidal value depends on the arsenic should be sold on a comparative 

 basis. When users of spraying mixtures demand that the goods 

 bought be of a certain quality, the supply will be forthcoming, as it 

 was in the case of coinn^efcial fertilizers. 



Geo, W. Cavanaugh. 



