[7-463.] 
TENTH CENSUS 
A Wo Pepartment of the A{nterior, 
UNITED STATES, 
L - CENSUS OFFICE, 
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* Brookline, Mass.,— Tao 
DEAR Sir: It has been necessary for the investigation into th Tprest Wealth of the United States, 
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undertaken in connection with the Tenth Census, to make large qpllections of the wood of all indigenous North 
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American Trees. I have had suchiportions ‘ofythese collections as have not been used up, in the experiments 
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made with the view of determining the comparative value of our woods, worked into museum sets, which I 
am. instructed by the Superintendent of Census to distribute among the Agricultural Colleges and Tech- 
nical Schools of the United States established by the acts of 1863-64, and among other institutions of learning 
in this country and Europe. These sets are generally quite full, and contain a large number of rare and little- 
known species. The specimens have been carefully prepared; they are six inehes long, but vary 
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in size; generally, but not always, they show the bark, sap, and heart-wood of the tree, and are admirably 
adapted to illustrate the characters of North American woods. 
Recipients of these sets will be expected to pay the cost of packing-cases and transportation from 
Brookline. 
Should you desire to receive one of these sets for the establishment over which you preside, you are 
requested to inform me of the fact at your early convenience, and instruct me in what manner you desire to 
have them sent to you. 
The sets will be ready for distribution during the month of April. 
Yours, very truly, 
Special Agent Tenth Census. 
