LETTER OF TRANSM1TTAL. 



U. S. DEPARTMENT or AGRICULTURE, 



BUREAU or CHEMISTRY, 

 Washington, D. ., May 31, 1912. 

 SIR : I have the honor to transmit for your approval a manuscript 

 prepared in this bureau by Mr. W. J. Young, of the Microchemical 

 Laboratory, on the microchemical examination of nuts with special 

 reference to their identification when in a comminuted condition. 

 This work is not claimed to represent an exhaustive study of the 

 histology of the seeds, but is rather a study of those features which 

 can be considered in the identification of the nuts when pure or 

 mixed with others. Since there has been a demand for such infor- 

 mation in connection with the examination of certain food products, 

 I recommend that these results of investigations extending over sev- 

 eral years be published as Bulletin 160 of the Bureau of Chemistry. 

 Respectfully, 



R. E. DOOLITTLE, 

 Acting Chief of Bureau. 

 Hon. JAMES WILSON, 



Secretary of Agriculture. 



ADDITIONAL COPIES of this publication 

 -i- may be procured from the SUPERINTEND- 

 ENT OF DOCUMENTS, Government Printing 

 Office, Washington, D. C. at 10 cents per copy 



