LETTER OF TRANSM1TTAL. 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF CHEMISTRY, 

 Washington, D. C., October 15, 1910. 



SIR: I beg to submit for your inspection and approval the results 

 )btained in an investigation made in this Bureau by F. P. Veitch 

 md M. G. Donk on the adulteration and grading of turpentines. 

 Fhe results show the extent to which turpentine is adulterated, and 

 ndicate the loss of values to the turpentine farmers, and the extent 

 >o which turpentine users are defrauded by adulteration. Methods 

 'or the analysis and testing of turpentine have been simplified and 

 mproved. Based largely on this investigation and the field work 

 connected therewith, specifications for grades are suggested which 

 t is believed will prove equitable to the producer and enable the 

 purchaser to secure turpentine of the character desired. The data 

 )btained are thus of special interest to the buyers and sellers of this 

 product. I recommend that this report be published as Bulletin No. 

 135 of the Bureau of Chemistry 



Respectfully, H. W. WILEY, 



Chief of Bureau. 

 Hon. JAMES WILSON, 



Secretary of Agriculture. 



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