Bui. 195, U, S. Dept. of Agriculture. 



Plate XVI. 



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 combhied progeny of No. 25 on the left and of No. 2 on the right. 



f-iG. 2.— Variation in Yield Between Tuber Units from the Same Hill. 



T)i« uj.pcr cut showti the j^ro^'cny of two tiilicpM from liill srlcctiou No. ;i5; Clio luwur cut tliat 

 fruiii hill ,'-i:lc;ction No. 4. 



