48 Richard H. Boerker 
CLASSIFICATION OF SPECIES BASED UPON THE Errect oF Soil Moisture upon 
GERMINATION 
Eastern Hardwoods 
Xerophilous Species Xero-mesophilous Species Mesophilous Species 
Robinia pseudacacia Catalpa speciosa Catalpa speciosa 
Acer rubrum (Neb.) (Ind.) 
Quercus rubra 
Betula papyrifera 
Eastern Conifers 
Pinus divaricata 
Pinus divaricata Pinus palustris 
Ga, Ss) Abies balsamea 
Pinus resinosa Pinus strobus Pinus taeda 
Rocky Mountain Species 
Pinus ponderosa (S. Abies concolor 
1D), 
Pinus ponderosa (N. Abies grandis 
Pinus ponderosa(H.) Abies lasiocarpa 
Pinus ponderosa Pinus contorta 
(Id.) 
Pseudotsugataxifolia - Pseudotsuga taxifolia 
(N. M. 
Pseudotsuga taxifolia (Mon.) : ; 
Id. 
Pseudotsuga taxifolia Pinus ponderosa 
(Colo.) 
Pinus monticola (Mon.) 
Pacific Coast Species 
Libocedrus decurrens Pinus ponderosa Tsuga heterophylla 
(Calif.) 
Pinus jeffreyi Picea sitkensis 
Pinus coultert Pseudotsuga taxifolia 
(Wash. ) 
Pinus lambertiana 
Abies magnifica 
Sequoia washington- 
tana 
In Table VI in every case where conclusions were possible it 
was noted that the beginning of germination was delayed and the 
germination period was shortened with the decrease of soil mois- 
ture. In every case the germination per cent. was highest in the 
wet soil culture. 
For some unaccountable reason Libocedrus decurrens ger- 
minated in the very dry and wet cultures but not in the medium 
wet one. However, the four drought resistant species stand out 
