DRY GRASSLAND OF A MOUNTAIN PARK 



261 



fair degree of accuracy from comparison" with Weather Bureau 

 stations at various altitudes within a radius of thirty miles. 

 Winter is somewhat cooler than winter at Chicago with just as 

 high winds but lower relative humidity ; summers are cooler than 

 at Duluth and considerably drier. 



All the soil of the dry grassland area is of a sandy nature, 

 with scattered pebbles and even boulders. Little humus is 

 present except is glacial sinks and at the foot of slopes. De- 

 terminations of soil temperature and soil moisture have been 

 made during a number of seasons, 1909-15 inclusive. Some of 

 the results have been published. i- For the sake of brevity only 

 the briefest summary is presented (in table 1). 



TABLE 1 

 Soil temperature in degrees Fahrenheit, 3 dm. below surface 



May, 8 readings 



June, 15 readings 



Jul J', 24 readings 



August, 59 readings — 

 September, 13 readings 



66 

 68 

 74 

 69 

 61 



AVERAGE 



47 

 58 

 64 

 62 



58 



40 

 49 

 58 

 58 

 55 



Water-content studies were made chiefly during June, July 

 and August of 1911 and 1913. The results of 12 determinations 

 for each of five societies is shown in table 2. 



Probably an error. The next lowest was 3. J 



" Annual summaries of the Colorado section of the Climatological Service 

 of the Weather Bureau. U. S. Dept. Agric. 



1- Ramaley, Francis, 1910, I.e. 



Ramaley, Francis and Mitchell, Louis A., Ecological cross-section of Boulder 

 Park. Univ. Colo. Studies 8: 277-287, 1911. 



