LETTER OE TRANSMITTAL. 



U. S. Department of Agriculture, 



Bureau or Plant Industry, 



Office of the Chief, 



Washington^ D. C.^ August 26^ 1910. 



Sir : I have the honor to transmit herewith and to recommend for 

 l^ublication as Bulletin No. 195 of the special series of this Bureau a 

 manuscript by Mr. Frank Rabak, Chemical Biologist, entitled " The 

 Production of Volatile Oils and Perfumery Plants in the United 

 States," submitted by Dr. B. H. True, Physiologist in Charge of the 

 Office of Drug-Plant, Poisonous-Plant, Physiological, and Fermenta- 

 tion Investigations. 



There is a steady demand for information concerning plants yield- 

 ing materials used in the manufacture of perfumery products; also 

 concerning the processes and apparatus required to utilize these oil- 

 bearing plants. This line of agricultural work has not yet reached 

 any marked development outside of the peppermint industry in ]\Iich- 

 igan, New York, and Indiana, but the outlook for a further growth 

 of this branch of special agriculture seems worth consideration. 

 Much experimental work will be required to determine the most 

 favorable locations for operation, and practical experience in hand- 

 ling the crops and the special apparatus needed in utilizing them must 

 be accumulated. However, the economic significance of this class of 

 products seems likely to justify the efforts required. 

 Respectfully, 



G. H. Powell, 

 Acting Chief of Bureau. 



Hon. James Wilson, 



Secretary of Agriculture. 



195 



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