HARRIS AND AVERY: MORPHOLOGICAL VARIATIONS 119 
RECAPITULATION 
This paper presents the results of a first attempt to determine 
some of the correlations in the structural variations of the seedling 
of Phaseolus vulgaris. 
rhe materials are drawn from a series of lines of Navy beans 
grown for the past several years at the Station for Experimental 
Evolution. The seeds used were harvested from plants of selected 
ancestry. Neither of these factors will, we believe, invalidate the 
conclusions drawn in this paper. These conclusions will not neces- 
sarily apply to certain entirely abnormal races. 
Fasciation-like broadening of the axis and longitudinal division 
of the axis distal to the insertion of the primordial leaves are both 
more frequent in seedlings showing separation of the cotyledons 
and in tricotyledonous seedlings than in those which are normal. 
Seedlings which are normal except for the separation of the 
cotyledons and those which have three cotyledons and a normal 
pair of primordial leaves or three cotyledons and a whorl of three 
primordial leaves produce a larger number of leaves, a larger num- 
ber of leaflets and a higher percentage of leaves with lobes at the 
third node than do those which are normal in their cotyledonary 
and primordial leaf characters. 
Seedlings which are tricotyledonous, with either a normal pair 
or a whorl of three primordial leaves, show higher percentages 
of variation in the axis, or the leaves produced by the axis, distal 
to the primordial leaves than do those which are normal except 
for the separation of the two cotyledons. 
These studies will be continued. 
STATION FOR EXPERIMENTAL EVOLUTION, 
CoL_p Sprinc Harsor, NEW YorK 
