56 Richard H. Boerker 
Tables X, XI, and XII give the results of the effect of light, 
soil moisture, and soil texture upon certain groups of species as 
they were classified on page 48. While the foregoing tables 
group the species and the final results on the basis of the geo- 
graphical distribution of the species, these tables divide all species 
into three groups based upon the amount of soil moisture neces- 
sary for germination. The tabulation of the final data on this 
basis is probably more significant than any other that could be 
offered. 
The data for the xerophilous species are given in Table X. 
The average figures given at the bottom of the table show that 
germination begins first in the dense shade, next in the medium 
shade, and last in the light ; that the germination period is longest 
in the dense shade; that germination begins last in the dry soil; 
that the germination period is shortest in the dry soil; that 
germination begins first in the gravel and that the shortest ger- 
mination period is in the loam and gravel. Of the 14 species 
given in this table, 13 germinated in the dense shade before they 
did in the open, 9 showed longer germination periods in the dense 
shade than in the open light, 12 germinated in wet soil before 
they did in dry soil, 13 had shorter germination periods in the 
dry soil than in the wet, and 9 germinated in gravel before they 
did in loam. 
Table XI gives the results for the xero-mesophilous species. 
The average figures given in this table show that germination 
begins first in dense shade, next in medium shade, and last in open 
light ; that the germination periods are longest in the medium and 
dense shade; that germination begins last in the medium dry soil; 
that the germination period is shortest in the medium dry soil; 
that germination begins first in the sand or in the gravel; and 
that the germination period is shortest in the gravel. Out of 13 
species listed in this table 9 germinated in dense shade before 
they did in the open, 7 showed longer germination periods in the 
dense shade than in the open light, 12 germinated in the wet soil 
before they did in the medium dry soil, 12 showed shorter ger- 
mination periods in the dry soil and 9 out of 11 germinated first 
in either sand or gravel. 
