9 



Potato Bug Finish : "Bug- Finish" is another insecticide that is now 

 on sale in various localities. It is sold at the same price as "Black 

 Death." The following- is the composition of the sample analyzed: 



Moisture I2 -49 



Sand, etc 17-57 



Insoluble organic matter 0.69 



Sulphur trioxide 3°-47 



Calcium oxide 2 5-79 



Carbon dioxide c.77 



Magnesium oxide 1.49 



*Paris green L06 



Iron and aluminum oxides 1.13 



Undetermined (water of crystallization, volatile matter, 



etc -) : • 3-54 



100.00 



One hundred pounds of this mixture contains only a little over one 

 pound of Paris green ; the remainder is largely sand and gypsum. The 

 Paris green in it costs $1.56 per pound. 



Kno Bug : The manufacturers of this insecticide claim that it kills 

 the bugs, stimulates the plant, and improves the quality of the crop. It 

 sells in 20-pound boxes at 6 cents per pound. According to our analysis, 

 it has the following composition : — 



Moisture 10. 89 



Insoluble matter 10 -55 



Sulphur trioxide 26. 10 



Calcium oxide 26.73 



Carbon dioxide n-95 



Magnesium oxide 3. 09 



Iron and aluminum oxides 4-°3 



Potash, nitrogen-potassium nitrate 4.50 



fParis green 2.49 



100.00 



It is essentially crude gypsum with 2\ per cent, of Paris green, and 

 potash and nitrogen equal to about 4.5 per cent, of potassium nitrate. The 

 latter is a valuable plant food; but, as there is only about 25 cents' worth 

 in 100 pounds of the mixture, it does not add very much to its cost. 

 Anyway, it would appear to be a better practice to keep insecticides and 

 fertilizers separate. Without allowing any value for the other materials, 

 the Paris green in this mixture would cost $2.41 per pound. 



* Copper oxide .32 per cent. ; Arsenious oxide, .70 per cent. 

 f Arsenious oxide 1.46 per cent. 



