WAXY ENDOSPERM IN HYBRIDS WITH SWEET CORN. DHS) 
are the heaviest, followed by the waxy and sweet. <A total of 3,161 
horny seeds weighed 790.3 grams, 2,387 waxy seeds weighed 565 
grams, and 5,247 sweet seeds weighed 1,028.3 grams. Reduted to 
weight per seed, these results give 0.253 gram for the horny, 0.237 
gram for the waxy, and 0.196 gram for the sweet. The average 
weight of the four classes, white horny, white waxy, white sweet, and 
colored sweet, was determined on 49 ears belonging to four families.* 
The results are shown in Table I. Since the average weight of seed 
differs on different ears, the comparative weights of the different 
classes are expressed in terms of the weight of the horny seeds. 
TABLE I1.—Weight of white waxy, colored sweet, and white sweet seeds of 
maize. 
Wagnils Number | White White Colored White 
ae of ears. horny. waxy. sweet. sweet. 
Saye Dil eens pte ence malls AY MEPS aye ee UE 12 100 | 93.841.02 | 77.7+1.52 77.441. 40 
TEAGUE) SRE ENS eco a ew 13 100 | 95.6+ .77 | 76.241. 71 76.4+1.45 
TDI DIB So Se tea Be ed os oe a Na ee 15 100 | 96.54 .95 | 79.34 .94 77.841. 28 
IDADA = GSE Re 2 Fg 5 A ap A ey Pod ea 9 100 | 94.2+ .93 | 76.8+1.20 |} 72.4+1.90 
PIS Galleerewt Raye ath eS Epes eM Cay) pay Ben 49 100 | 95.2+ .45 | 77.6+ .65 76.44 .71 
There appears to be no real difference in weight between the white 
and colored sweet seeds. The sweet seeds are, however, consistently 
lighter than the waxy, which in turn are lighter than the horny. The 
average difference between the sweet and waxy seeds is 22.5 per cent 
of the weight of the sweet; that between the waxy and horny is 
5 per cent of the waxy. The volume and specific gravity of the classes 
of seeds were also determined in eight of the ears. The results showed 
that the differences in weight were associated with corresponding 
differences in volume, the specific gravity being the same for all 
classes. 
COMPARISON OF RESULTS WITH MENDELIAN EXPECTATION. 
In the previous pages the classes occurring in the second generation 
of the sweet X waxy cross have been referred to as approximating a 
9:4:3 ratio. While this approximation is so close as to exclude the 
possibility of finding any other ratio that will more closely fit the ob- 
served number, the deviations are too large to be ascribed to chance. 
Table II gives the number of horny, sweet, and waxy seeds com- 
pared with the number expected in accordance with the above ratio. 
For both the horny and waxy it will be seen that the deviation for 
the entire series is more than five times the probable error. In the 
case of the sweet seeds the total deviation is no greater than should 
1The two classes, colored horny and colored waxy, could not be weighed accurately, 
Since these seeds had been clipped in order to determine whether they were horny or 
waxy. 
[Cir. 120] 
laecanen 
