34 



BULLETIN 824, U. S. DEPARTMENT OF AGRICULTURE. 



Unger (282) reports certain results of examination of Pyrethrum 

 flowers (Table 7). 



Table 7. — Chemical analysis of Pyrethrum flowers and powder ( Unger). 





Product. 



Determination. 





Sam- 

 ple 

 No. 



Mois 



Dried 



over 



H2SO4. 



ture. 



Loss at 

 100°. 



Ash on 

 water- 

 free 

 basis. 



Remarks. 



1 



Closed Dalmatian flowers 



Per cent. 



7.02 

 12.08 

 11.45 



5.49 

 10.29 



6.76 



5.39 



Per cent. 

 8.4 



Per cent. 

 7.67 

 6.89 

 6.04 

 7.07 

 7.12 

 7.56 

 6.21 



Much manganese present. 



2 



do 



Do. 



3 



Open Dalmatian flowers 





Do. 



4 







Do. 



5 





10.81 



Do. 



6 



Powdered closed Dalmatian flowers. 





7 





Do. 











Three samples of flowers, 2 of Pyrethrum roseum and 1 of P. cau- 

 casicum, grown near Berlin, were examined, the results in Table 8 

 being secured. 



Table 8.^ — Chemical analysis of insect floioers groivn near Berlin. 





Product. 



Determination. 





Sam- 

 ple 



No. 



Mois- 

 ture 

 (loss at 

 100°). 



Ash on 

 water- 

 free 

 basis. 



Remarks. 



1 



Flowers of P. carneum 



Per cent. 

 8.3 

 5.67 



4.88 



Per cent. 

 8.18 

 7.92 

 10.21 



Much iron present, but no manganese. 

 Iron (0.19 per cent) present. 



2 





3 



Flowers of P. carneum 









Unger (282) reports the analyses given in Table 9 for adulterated 

 insect powders. 



Table 9. — Chemical analysis of adulterated insect -powders (Unger). 



Sample 

 No. 



Product. 



Ash. 



Remarks. 



1 

 2 



Insect powder 



do 



Per cent. 

 6.61 

 9.7 

 7.3 

 7.93 

 8.33 

 7.39 



Stems present; almost no pollen grains. 



Curcuma and stems present; pollen grains few. 



Curcuma present; no manganese. 



Barium chromate and many stems present: no pollen grains. 



Lead chromate and many stems present; few pollen grains. 



Very Uttle manganese; curcuma present. 



3 



....do 



4 



do 



5 



do 



6 



do 







