INSECT POWDER. 



63 



duction of mineral matter during the <^riiKliiig as a result of abrasion 

 from the mill. In the case of stone mills there would be some wearing 

 of the stones and a small amount of material would be introduced 

 into the powder in this way. It can readily bo seen, however, that 

 if this were sufficient to increase the ash content appreciably, say, 

 1 per cent, there woidd soon be nothing left of the miU. 



In order to determine whether there was any marked difference in 

 the composition of the powder from that of the flowers from which 

 it was made, a number of samples of "closed" Japanese flowers were 

 collected immediately before entering the mill and samples of the 

 ground product as it came from the mill. Owing to the great capac, 

 ity of the milling and sieving machinery, the powder from any par- 

 ticular sample of flowers could not be identified, but when collected 

 over a period of a worldng day an average of ail samples collected 

 should be representative of the material. In Table 41 are given the 

 analyses of these samples, wliich represent a run of about 60 bales 

 (25,000 pounds) of ''closed " Japanese flowers. Table 42 contains the 

 results of analyses of Japanese stems before and after grinding. 



Table 41. — Analysis of Japcmese "closecF' flowers before and after grinding. 



Flowers. 



Powder. 



Nitrogen, 



N. 



Ash. 



Ash in- 

 sohible 



Nitrogen, 



N. 



Ash. 



Ash in- 

 sohible 





in HCl. 





in HCl. 



Per cent. 



Per cent. 



Per cent. 



Per cent. 



Per cent. 



Per cent. 



1.96 



6.75 



0.28 



1.7,35 



6.77 



0.53 



1.66 



6.95 



.32 



1.705 



7.15 



.74 



1.82 



6.85 



.65 



1.89 



6.56 



.45 



1.78 



6.67 



.29 



1.84 



7.19 



.77 



1.72 



6.92 



.68 



1.88 



7.61 



121 



1.76 



7.09 



.79 



1.76 



7.40 



1.00 



1.77 



7.01 



.74 



1.77 



7.47 



.94 



1.79 



6.88 



.47 



1.74 



7.47 



.92 



1.80 



7.15 



.82 



1.81 



7.53 



1.03 



1.94 



7.43 



.97 



1.65 



6.84 



.82 



1.76 



7.70 



1.21 



1.81 



7.75 



1.07 



1.73 



7.19 



.77 



1.73 



7.48 



1.04 



1.82 



7.39 



.97 



1.85 



8.23 



1.45 



1.76 



6.96 



.60 



1.77 



7.71 



1.09 



1.81 



7.40 



.98 



1.68 



7.50 



.99 



1.81 



7.26 



.81 



1.73 



7.72 



1 31 



1.88 



7.33 



.79 



1.79 



8.58 



1 82 



1.84 



8.58 



2.03 



1.70 



7.4? 



1 U6 



1.84 



7.72 



1.11 



1.79 



7.37 



.86 



1.91 



7.46 



.89 



1.76 



8.97 



.64 



1.87 



7.50 



.94 



1.87 



8,15 



1 . 33 



1.82 



7.63 



1.05 



1.80 



8.19 



1.64 



1.81 



7.84 



1.22 



1.76 



7.44 



1.04 



].80 



7.72 



1.34 



1.76 



7.57 



1.15 



1.90 



8.22 



1.83 



1.79 



7.81 



1.29 



1.70 



7.28 



1.04 



1.77 



7.43 



1.05 



1.93 



7.26 



1.07 



1.77 



7.64 



1.27 



1.90 



8.31 



1.77 



1.73 



7. .56 



1 14 



1.91 



7.82 



1.36 



1.77 



7.55 



1.13 



1.98 



7.68 



1.15 



1.77 



7.42 



1.12 



1.87 



7.,^ 



1.05 



1.80 



7.93 



1.46 



1.84 



7. 37 



.99 



1.80 



7.59 



1.10 



1.91 



7.12 



.76 



1.52 



6.59 



.81 



1.77 



7.22 



.94 









1 1.S3 



t 7.42 



1 1.00 



1 1.77 



17.54 



11.10 



' Average. 



