26 A Study of the Vegetation of 
A chemical analysis not only confirms the low amount of vola- 
tile and organic matter, but also shows, as one would expect, the 
low nitrogen content of the new soil covered with bunch-grass 
(Table ii): 
TABLE III 
CHEMICAL ANALYSES OF SOILS FROM VARIOUS PLANT COMMUNITIES IN 
SOUTHEASTERN WASHINGTON AND ADJACENT IDAHO 
Phos- So- | Total | Vola- 
Lime,| Pot- | phoric] Soda) dium | cojy_ |tileand/Insolu-| fy, | Total 
CaO | ash, | Anhy-| Ash,| Tri- ble Or- ble mus | Nitro- 
K20 | dride, |Na2O) oxide, | sj, | ganic | Matter gen 
P205 SO3 Matter 
: { 
Agropyron consocia- 
tion, «Coalfaxtim.) sr I.08| 0.58 | 0.31 | 1.32] 0.034] 15.02] 5.35, 79.63] 1.06 | 0.096 
Festuca consociation, 
Coliaxccscn/e's hs sie I.27| 0.54 | 0.29 | 0.47| 0.037| 13-77] 6.32) 79.91! 2.88 | 0.176 
Festuca consociation, 
Kamiak Mt...... I,03] 0.45 | 0.29 | 0.06] 0.047| 13.50] 5.95) 80.55] 2.77 | 0.182 
Pseudotsuga- Larix 
community, Ka- 
miak Mt..........| 0.85) 0.32 | 0.41 | 0.41] 0.030] 12.73] 4.95| 82.32] 1.12 0.081 
Thuja consociation, 
Cedar Mountain. .| 1.17] 0.23 | 0.59 | 0.07] 0.075| I14.77| 13.65: 71.58] 6.39 | 0.399 
Pseudotsuga-L arix- 
Abies community, 
Cedar Mountain. .| 0.52] 0.23 | 0.33 | 0.03] 0.044] 14.62] 8.76 76.62] 3.45 | 0.207 
A second set of stations was maintained on Kamiak Mountain, . 
a bold butte lying 9 miles north of Pullman, and one of a series 
extending in a westerly direction from Thatuna Hills. This 
butte running from east to west for a distance of over 2 miles, 
and reaching an elevation of 1,000 feet above the surrounding 
hilltops, is covered on the south side with prairie, while the 
steeper north slope bears a dense forest of Douglas fir and west- 
ern larch (Figs. 36 and 37). 
On the south side trees occur only near the summit, where out- 
cropping rocks furnish in their crevices a sufficient shelter and 
water supply for the establishment of the seedlings. Here is a 
very open growth of yellow pine which flanks the fir and tamarack 
and also occupies the less sheltered north base below the fir- 
tamarack community. In fact, this mountain offered so many 
interesting conditions of slope, exposure, and vegetational cover, 
that 13 stations were maintained here during 1913. 
26 
