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A TEXT-BOOK OF BOTANY. 



may be due in large part to the fact that it requires a limestone soil, 

 and in practice the most favorable results are obtained where there 

 is an underlying bed of blue limestone. Sufficient has been said 

 to show that success will attend the cultivation of medicinal 

 plants, and indeed, by a priori reasoning on the basis of other 



Fig. 410. Form of American Cannabis developed by F. A. Miller. Such forms are 

 obtained by selection and result in strains that are better adapted to modern methods of 

 agriculture and from which the collection of the pistillate inflorescence is greatly simplified. 

 — From Experimental Farm of Eli Lilly & Company, Indianapolis, Ind. 



agricultural efforts, one would expect that medicinal plants could 

 be grown with the same certainty of increasing the yields of any 

 particular constituent or quality that might be desired. Indeed, 

 the history of the sugar beet industry has been duplicated in the 

 work on Cinchona, and the sam_e thing can be said with regard to 

 any other plant that man desires to conserve and cultivate. There 



