Germination of Forest Trees Bal 
The two species that stand out as having the greatest germina- 
tion per cent. in the loam are Quercus rubra and Acer rubrum.: 
Nine species reached their highest germination per cents. in the 
sand and in this group the following stand out most conspicu-: 
ously: Pinus diwaricata, Pinus resinosa, Pinus palustris, Pinus 
taeda, and Robinia pseudacacia. Being species of sandy habitats. 
it is quite easy to see why they should germinate better in the 
sand. In the gravel, which is a poor moisture retainer, it is in- 
teresting to compare such a drought enduring species like. Pinus 
divaricata and such a moisture-loving species like Pinus taeda. 
On page 50 are given the curves for Pinus divaricata and Pinus 
resinosa. . 
ADVE le Vell 
Tue Errect or Soil Texture oN GERMINATION 
Rocky Mountain Species 
Loam Sand Gravel 
v » a - _— 
ies 3 Fat |2) ea SE el ry aelica) Seats top es) Can liens 
a faF [ee oO jam eS ae aA | es 
Pinus ponderosa.......... S.D. TOME SZ 5S-Ole oe 2ON 57251028) |) 3S) 4450 
Pinus ponderosa.......... Harney | 14 | 14 | 52.0) 14 | 26 | 45.0) 14 8 | 13.0 
Pinus ponderosa.......... INES || Zt |} ZO || 5OO} LO |) BO || Garey) a | 1s || Rares 
Pseudotsuga taxifolia ..... N.M. | 12 | 26 | 63.0] 10 | 22 | 70.5] Io | 14 | 63.5 
Pseudotsuga taxifolia...... Colo. | 12 | 42 | 912.0] Io | 38 | 83.5] Io | 44 | 80.0) 
Abtes concolor............ Colo. | 24 | 50 | 38.0! 18 | 66 | 51.0] 20 | 48 | 34.0. 
IZ EMS COMO. s ccccgeeasd (COO jf 14 |) BO | 22a) 2 |) CO | US) 2O |) FO | A055 
Pinus ponderosa.......... Mon. | 18 | 12 | 10.0] 18 | 48 | rr.0} 18 Te | eee O, 
Pseudotsuga taxifolia...... Mon. ! 14 | 34 | 20.5! 12 | 44 | 43.0! 12 | 42 | 44.5. 
Pseudotsuga taxifolia...... Idaho | 18 | 30 | 20.5) 20 | 54 | 11.0; 16 | 70 | 43.0% 
WU Se PON GELOSG= se Idaho | 36 | 52 | 43:0] 44 ; 52 | 509.0) 20 , 78 | 71.0 
MNES (FMD cod Ceaanooce Idaho | 36 | 36 | 4.0} 46 © | 20) 26 | BO | Zoey 
Albves lasvocar, pay. sane ae ae Idaho | 30 | 30 | 6.0) o (0) (0) to) (0) fo) 
ACU S MMONLUGOL Opes ee eee Idaho | 24 | 50 | 22.5) 24 | 50 |11.5| 24 | 50 ! 13.5: 
Table VIII gives the results for the Rocky Mountain species. 
Out of 13 species, 8 germinated first in sand or in gravel, only 
one germinated first in loam, and four germinated simultaneously ' 
in loam and in sand or gravel. Eight species show a longer | 
period of germination in sand or gravel than in loam, and 5' 
species show the same length of period in either sand or gravel 
and in loam. Six species show a higher germination per cent. in 
