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A TEXT-BOOK OF BOTANY. 



sufficiently to be planted directly in the soil. This transferring 

 should be done not later than the early part of May. The structure 

 and use of the cold frame is perfectly familiar to the practical 

 gardener. 



Sometimes the individual plants are removed from the flats 

 and placed directly in the soil of cold frames. This may give 

 them a temporary setback, as the roots are more or less disturbed 



Fig. 403. A general view of the testing and breeding of medicinal plants at the Experi- 

 mental Farm of Eli Lilly & Company, Indianapolis, Ind. 



by the operation, but if the experiment in the cold frames is to be 

 continued considerable time will be saved. 



If the plants are to be transplanted out of doors it is desirable 

 that this should be done as soon as possible after the last days 

 are over for the possibility of frost. The plants are arranged 

 in rows and set sufficiently far apart so the maximum crop per acre 

 can be obtained (Figs. 403-407), and also that weeds may be 

 pulled out and the ground worked over. 



The above outline given may be used for the propagation of 



