New York Agricultural Experiment Station. 85 
TUBEES FEOM THE 
MOST PKODUCTTVE 
HILLS. 
TUBERS FBOM THE 
LEAST PEODUCTrVE 
HILLS. 
Merch., 
lbs. 
Total, 
lbs. 
Merch., 
lbs. 
Total, 
lbs. 
"R m "Rr»w 1 
89% 
97% 
89% 
82% 
105% 
119% 
108 
102 
Row 2 
87% 
117 
80% 
83% 
104% 
136% 
97% 
99% 
3 
4. 
5 
g 
7 
8 
Aggregate 
Aggregate 
359% 
435 
368% 
438 
B 13, Row l 
Row 2 
132% 
140% 
130% 
123% 
146% 
155% 
149% 
139% 
122% 
131 
119% 
114 
139% 
151 
136% 
134% 
3 
4 
5 
6 
7 
8 
Aggregate 
Aggregate 
527- 
591 
4$6% 
561 
Aggregate for the 
two plats 
Aggregate for the 
886% 
1,026 
855 
999 
In B 10 the aggregate merchantable yield from the most productive 
hills is 9 lbs. less than that from the least productive, but in B 13 it 
exceeds the same by 40J lbs. The aggregate for the two plats shows 
an excess in favor of the most productive hills of 21 J lbs. of merchant- 
able, and 27 lbs. of total yield. 
If we consider each two adjoining rows as one series, we have in the 
six plats twenty-four series, in each of which is one row planted with 
seed from the most productive and one from the least productive hills. 
Laying aside exact numerical values, and considering the yield only in 
terms of greater or less, which is about all that the plat system war- 
rants, it appears that the merchantable yield of the row from the most 
productive hills exceeded in seventeen cases out of twenty-four. 
From the data, it appears further that the greatest difference in the 
yields of any two rows planted with the same selection of seed was in 
the merchantable yields fifty-nine lbs. ; in the total yields fifty lbs. 
The greatest difference in the yields of any two rows planted with 
different selections of seed was, merchantable fifty-five lbs., total fifty- 
six lbs. In other words, the differences in the yields of rows planted 
with the same selection of seed are on the average fully as great as 
in those planted with different selections. The plat trials therefore 
do not prove that the seed from the most productive hills was really 
more favorable to crop than that from the least productive hills. 
They do, however, give strong evidence in favor of the seed from the 
most productive hills. 
When we consider the results of all the trials that have been made 
at the station in the use of seed tubers from productive and unpro- 
