POTATO BREEDING AND SELECTION. 
31 
the strong plants and a total gain of over 500 per cent. The graphic 
chart shown in figure 1 illustrates quite clearly the marked differences 
in vine and tuber production. It would be misleading to leave the 
A^-<erage y7'e/o J per(/nitV z 
f/3//and/9/Z) 
Ttvenf/ef/? CentuM 
(Acc-N*6690) p/2[ 2 
M c Gormicf< 
(Ace- /T? 6/58) 
/r/s/7 Cobbier 
(Acc-N?4970J \l9/2\ 2 
Rurai 3/osr? 
(Acc-A /0 3480) 
Carman A/?-/ 
(Acc-N?4235) j/^/^j 2 □ 
(Accr//*£036) P#(2D 
/9// 
Green Mountain 
fAcc-A/18666) \'3 /2 \2^ 
Green Mountain 
(Agg.-N*4966) \w2\2mn 
2 1 1 
Aiorcross \ \ 
(AccrA/e£<460) \9/2V 2l 
Gotd Coin 
(Ace.- A/9-4972) \ /9/2 \ 2 
Beauty -of 'Hebron 
fACCrA/*424S) \/9/2[ 2 
tiorcross 
(Acc-N* £462) |/S/2( Z 5J 
~ Primes 
-Cutis 
/-Strong 
Z~Wedk 
Fig. 1. — Diagram showing the relative yields between strong 
and weak tuber-unit plants at Honeoye Falls, N. Y., in 1911 
and 1912. 
impression that these data represent the gains that are likely to 
accrue through selection. The lesson that these data should convey 
is that tubers from weak, unproductive, or diseased plants produce 
similar or even worse progeny and that the greatest benefit derived 
