Bui. 195, U. S. Dept. of Agriculture. 
Plate XVI. 
(, v V ' 
X i 
Fig. 1 .—Progeny of Three Tuber Units each of Hill Selections Nos. 2 and 25. 
The upper cut shows the progeny of selection No. 2, the center one that of No. 25, and the 
lower cut the combined progeny of No. 25 on the left and of No. 2 on the right. 
Fig. 2.— Variation in Yield Between Tuber Units from the Same Hill. 
The upper cut shows the progeny of two tubers from hill selection No. 35; the lower cut that 
from hill selection No. 4. 
