IKON SULPHATE SCKOFULARIA P. D. (J. INSECT POWDER. 49 



IRON SULPHATE. 

 [Serial No. 20370.] 



Composition of Iron Sulphate. 



Per cent. 



Sand 0. 06 



Ferrous oxid 31. 65 



Sulphur trioxid 34. 01. 



Water of crystallization and hygroscopic 33. 50 



99.82 

 This is evidently a good .sample of partially dehydrated FeSO 4 7H 2 O. 



SCROFULA HI A." 



[Serial No. 19681.] 



Composition of Scrofularia. 



iVr cent. 



Moisture 4. 91 



Ash 19. 52 



Ether extract 7. :>."> 



The oil extracted is black and tarry, and has a slight smell of both 

 pyrethrum and tobacco. Small amounts of lead and chromium are 

 also present. 



This sample evidently consists of tobacco and pyrethrum, colored 

 with lead chromate. 



SULPHUR. 



[Serial No. 19636.] 



Composition of Sulphur. 



Per cent. 



Moisture 0. 58 



Ash : t)7 



Volatile mutter, other than moisture W. :',."> 



100.00 



This is an excellent sample with a very small content of moisture 

 and ash. 



P. D. Q. INSECT POWDKK. 



[Serial No. 19676.] 



Composition of. P. D. Q. Insect, Powder. 



Per cent. 



Moisture 2. 62 



Sulphur 15. 59 



Ash insoluble in hydrochloric acid 64. 51 



Ash soluble in hydrochloric acid 15. 23 



What appears to be coal-tar products ( by difference) 2. 05 



100.00 



"See correspondence with manufacturers, page 60. 

 1J-J01 No. 6802 



