40 LUTHER BURBAXK 



necessary to let all the seedlings grow for several 

 years, or at the very least to wait two or three 

 years for the grafted cions from each seedling to 

 come to fruitage. 



The practical experimenter, seeking results, 

 cannot possibly work in this narrow way when 

 he works on a large scale. 



He must be content to select from among 

 thousands of seedlings the one or five or ten or 

 fifty that appear to him most promising. To 

 these he must pin his faith, and all the rest must 

 be destroyed to make room for other plants. 



Otherwise he would require not sixty-five acres, 

 which make up the total area of my experimental 

 farm, but hundreds or even thousands of acres. 



And to keep track of the multitudinous seed- 

 lings would require the aid not of the ten or a 

 dozen or so assistants whose cooperation makes 

 my experiments possible, but of a small army of 

 equally industrious workers. 



SYSTEMATIC WORK IMPERATIVE 



But, having thus outlined the limitations that 

 necessarily attend work conducted on a large and 

 comprehensive scale, let me now proceed to elab- 

 orate somewhat the other side of the story. 



Let me outline the various practical methods 

 of recording experiments that have been devel- 



