1924] 
HARRIS—THE INFLORESCENCE OF MANFREDA VIRGINICA 443 
collections the relation between number of fruits and seeds is 
more strongly negative than that between number of flowers 
and seeds. At least 2 of these differences may be significant in 
comparison with their probable errors. 
The correlation coefficients in these tables show that the rela- 
tionship between the number of flowers per inflorescence and the 
number of seeds per locule and between the number of fruits per 
inflorescence and the number of seeds per locule is very slight 
indeed. How slender it is may be best shown by the use of 
straight-line equations. In these the variable term shows the 
actual increase or decrease in number of seeds per locule associ- 
ated with an increase in the number of flowers per inflorescence 
or in the number of fruits per inflorescence. "Тһе equations are: 
Meramec Highlands, 1906, 
s = 12.9611 + .0250 f, s = 14.5414 — .0965 с 
Meramec Highlands, 1907, 
s = 11.9176 + .0291 f, s = 13.7444 — .1335 с 
Jefferson Barracks, 1906, 
s = 8.1589 + .0822 f, s = 11.5831 — .2173c 
Jefferson Barracks, 1907, 
s = 11.3520 — .0151 f, s = 12.6892 — .2585 c 
where s = seeds, / = flowers, and c = fruits per inflorescence. 
The lines and the empirical means are represented graphically 
for the relationship between number of flowers per inflorescence 
and number of seeds per locule in fig. 9, and for that between 
number ы fruits per inflorescence and number of seeds per locule 
in fig. 1 
Tho x mean numbers of ех per Іосше are distributed with 
с larity about the nearly horizontal lines showing 
the theoretical change i in mean number of seeds with variation in 
the number of flowers per inflorescence. There is, however, 
nothing in these lines to indicate that any single curve of a 
higher order would give a better representation of the relation- 
ship. 
The lines and empirical means for number of seeds per locule of 
fruits produced on inflorescences with varying total numbers of 
fruits (fig. 10) may indicate a slightly non-linear distribution of 
