a Te 
On the relationship between the number of ovules formed and the 
number of seeds developing in Cercis 
J. ARTHUR HARRIS 
(WITH THREE TEXT FIGURES) 
I. INTRODUCTORY REMARKS 
In an earlier paper* I have stated certain problems concerning 
the relationship between the number of ovules laid down and the 
capacity of the ovary for maturing its ovules into seeds, and have 
illustrated the methods which seem suitable to me for their 
solution by a series of data drawn from experimental cultures of 
Phaseolus vulgaris. The results of this first analysis of extensive 
series of data seem to render desirable the like treatment of other 
similar but quite distinct materials. The present paper is, there- 
fore, devoted to the analysis of numerous data from a wild small- 
seeded arborescent legume, Cercis canadensis. 
The study has been in progress since the autumn of 1905, when 
the first large series of countings was made. The results given in 
this paper were made ready for the press in January 1910, but 
the manuscript was laid aside in the hope that it would be possible 
to secure data which would show the relationship between the 
correlations discussed and the then just discovered selective 
mortality of ovaries. In this hope I have met with only disap- 
pointment, and it seems best to withold the materials no longer. 
II. MATERIALS 
The materials here analyzed were collected in three series as 
follows: 
A. A very large collection taken at Meramec Highlands, near 
St. Louis, Missouri; altogether 28,554 pods. 
B. A collection from 22 trees in the neighborhood of Lawrence, 
Kansas; 2,200 pods. 
* Harris, J. Arthur. On the relationship between the number of ovules formed 
and the capacity of the ovary for developing its ovules into seeds. Bull. Torrey 
Club 40: 447-455. Au 1913. 
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