22 
BULLETIN 958, U. S. DEPARTMENT OF AGRICULTURE. 
New Yorker there was a very decided grouping around the model 
class, 22.2 per cent of the entire number of hills falling in this class 
and 61.2 per cent in the 3, 4, and 5 tuber classes. In the Pearl there 
Was a much wider range of variability, with a considerable number 
120 
5 
:s; 
3 * 5 6 
■ i i I t 
K 
'3 IS 
% ■ % wtm <ii lift > 4 " *r 
7 8 & IO/I 12 13/^/5/6/7/8 19 Z02I 2Z&324Z52627 
A/CW&&? OF TUB£RQ£GR H/LL. 
Fig. 9.— Diagram showing the number of tubers per hill produced in 500 hills of Rural New Yorker (average, 
4.5) and 500 hills of Pearl (average, 6.9). 
of the individuals m the intermediate classes. The average hill pro- 
duction of this variety was 2.4 tubers greater than that of the Rural 
New Yorker. 
The curves for weight of tubers per hill (fig. 10) show that there 
was much greater uniformity in production in the Rural New Yorker. 
W&6HT0F WB£/?S PEft H/LU 
/ /0I 201 301 Ml 601 601 701 801 901 100! HOI 120113010011501/60/170118011901 
<S 
90 
80 
^70 
^60 
)k60 
W 
% 
&k 
7 
i 
# 
^ 
A 
j/ 
' A 
9 
s 
^ 
+A 
t 
i 
ft 
*•+ 
> 
N 
L 
/J 
Y 
— ™^ 
F — 
N 
\ 
/ 
S 
k^ 
L 
\ 
^ 
L, 
W3i 
WM5L 
wa 
W70 
080 
086 
OMk 
torn 
>$l% 
10I8L 
VM 
W/5i 
00/6 
Wtt 
V 
MIA 
00 IS 
W2L 
%%o 
GRftMS 
Fig. 10.— Diagram showing the weight of tubers per hill produced in 500 hills of Rural New Yorker (average, 
860.7 grams) and 500 hills of Pearl (average, 944 grams). 
The Pearl, however, produced the larger average yield, the weight 
per hill exceeding that of the Rural New Yorker by 83.3 grams. 
A further comparison of the behavior of different varieties of pota- 
toes under varying treatment respecting irrigation is shown in Table 
