CULTIVATION OF I^IEDICTNAL PLANTS. 743 



are no insurmountable obstacles in this work, and there are no in- 

 tricate processes to be solved before success results. There are 

 merely a few underlyin^^ principles that must be adhered to. and 

 by persistent effort and with a full understanding of market con- 

 ditions success must crown the efforts of anyone who undertakes 



Fig. 411. A seedling plant of Digitalis about six months old. 



this work. What has been done in the selection of fruits and vege- 

 tables can be equally well accomplished in drugs with the proper 

 incentive. 



Progress in the United States.— We can scarcely appreciate 

 that while the development of medicinal plant culture has been 



