THE PLUM IN KANSAS. 



39 



conjecture. Aside from a uniformly high percentage of defective 

 pistils at Madison, Wis. — Professor Goff's own location — the per- 

 centage rather decreases than increases northward. 



Table 3. — Comparison of Loealitirs. 

 Percentage of defective pistils. 



*Var. nigra. 



The first, and perhaps the chief, practical question to be settled is : 

 What varieties, under ordinary circumstances, are fertile with their 

 own pollen, and which are self-sterile ? A large number of blossoms 

 in the orchards of Mr. L. M. Macomber, North Ferrisburg, Vt., were 

 covered with paper sacks, in order to protect them from cross-pollina- 

 tion. The results from these are shown in table 4. 



* Weak. 



