1909.] 



PUBLIC DOCUMENT — No. 31. 



181 



Summary. 



These studies show, by careful aud accurate measurements, 

 and by more thorough methods than any hitherto applied to this 

 subject, that distinct modifications do occur in plum trees due 



Fisr. 4. 



to the influence of the stocks in which they are grafted. These 

 influences appear to extend to all characters of leaf, twig, habit 

 of growth, etc. Unfortunately, the present writer has not been 

 able to make equally careful observations of the fruit; but in 



