1r2 BOTANICAL GAZETTE [FEBRUARY 
formation and in a forest formation. The data collected from 
Kalispell, Montana, cover a period of from four to five years. This 
station is located in the prairie region of the valley. From a station 
at Columbia Falls partial meteorological data were obtained that 
will give an idea of the climate of the forested portion of the valley. 
Marquette, Michigan, was chosen as the station to represent the 
climatic conditions of northern Michigan; and Seattle, Washington, 
will stand fairly well for the kind of climate found in the Puget Sound 
region.® 
TEMPERATURE. 
The following table contains the latitude, longitude, altitude of 
the stations, the number of years data have been collected, and the 
mean annual and monthly temperatures (degrees Centigrade) for 
the four stations. 
TABLE TI. 
Stations Lat. Long. | Alt. |Years| Jan. | Feb. |Mar. |April | May | June] July | Aug. | Sept. Oct. | Nov.| Dec. HEE 
Kalispell......... boty? Pa 904™} 5 |—4.0/—4.5| 1.5] 6.0] 10.5] 14.0] 16.5] 16.0| 11.0] 7.0) 0©-5/—?-° ba 
Columbia Falls. . . ego 046 | 5 |—s.o|—4.5| 0.01 6.0] 11.5] 14.0] 18.0] 14.0] 10.0, 6.0] 0.0|\-43 # 
Marquette....... { See Ww. 224 | 29 |—9.0/—8.5|—5.0| 3.0] 9-0] 15.0] 18.0] 17.5] 13-5] 7-0}—9-5}75°° "i 
Seattle...........| eit = oem 1.5 | 12 5.5] 5.5] 7-0] 10.0] 12.5] 5.5] 17.5| 17-5] 15.0] 10-5] 7-0) %° " 
The significance of these figures will be clearer when it is known 
just how the temperature influences the various physiological pro- 
cesses. An examination of Table I and fig. 9 will show that the 
mean monthly temperatures during the growing season is rather 
low as compared with regions farther south; also, during the months 
of May, June, July, August, September, the means for the four 
stations are not far. apart; so that any difference in the type of 
vegetation in the four stations cannot be accounted for by differences 
in temperature during the so-called growing season. If the temper 
8 The data given in the tables below were obtained from the following ee 
in charge of the stations at their respective cities: Kalispell, Mont., H. B. Dic ; Mar- 
quette, Mich., H. R. Parricx; Seattle, Wash., G. N. Satispury. The cael for 
{in 
of Montana for 1900 and 1901. No sunshine records are kept at Marquette, so those 
from Escanaba, Mich., are taken to represent northern Michigan in that particular. 
