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. 





