HARRIS AND AVERY: MORPHOLOGICAL VARIATIONS 115 
not feasible to redtice these frequencies for the individual classes 
to a percentage basis for comparisons. This has, however, been 
done for larger groups secured by combining all the seedlings 
TABLE VI 
NUMBER OF LEAFLETS PRODUCED AT THE THIRD NODE BY SEEDLINGS OF VARIOUS 
TYPES 
Two cotyledons Twocotyledons | Three cotyledons Three cotyledons 
slightly —o =~ deg separated and and two and three 
bp int ed two primordial leaves | two primordial leaves primordial leaves ‘} primordial leaves 
Abnormal} Control | Abnormal | Control | Abnormal Control | Abnormal | Control 
I 2 | I eS I 
2 16 e 6 4 iis 3 2 2 5 
x 3,741 3,825 801 835 572 782 1,602 | 2,185 
4 27 at 5 4 I4 5 28 8 
5 10 2 I 3 2 
6 215 173 65 40 203 33 751 236 
4 Meee I +2 I wets 
8 ae e's I sigh 
9 I ras I 3 
10 I ae ee 2 
Ea & v's ae ee I 
Totals | 4,017 4,029 | 878 881 813 | 825 2,410 | 2,436 
showing merely separation of the cotyledons and all those showing 
three cotyledons instead of the normal two. The results are shown 
in the accompanying TABLE VII, which is self explanatory. 
TABLE VII 
COMPARISON OF THE NUMBER OF LEAFLETS IN DICOTYLEDONOUS AND TRICOTYLEDO- 
NOUS SEEDLINGS WITH THAT IN THEIR NORMAL CONTROLS 
Number of Seedlings with cotyledons separated Seedlings with three cotyledons 
leaflets 
Abnormal Control Abnormal Control 
I 12 .04 03 
2 12 -16 21 
a 92.79 94.91 67.45 90.98 
4 -5t T.3 -40 
5 -08 -4 15 
6 5.72 3-52 29.60 8.25 
<a 81 -74 
8 -03 
9 -02 32 
10 .02 06 
II -03 
A comparison may be made without the combination of dif- 
ferent grades of abnormality by grouping the number of leaflets 
