In the Guide, the classification of materials is made in ac- 



strictly botanical sequence although it leads to a wide separation 

 3i the products of the same species. 



exhaustively the economic value of a family, the other to exhibit 



and makes inordinate demands on valuable space. The best 



trates the different categories under which raw products enter 

 :he commercial field, and it is this treatment that characterizes 

 the Guide to the economic collections of the New York Botanical 

 Garden. 





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