1914] BRIEFER ARTICLES 527 
tion of each quadrat. Early in 1912 more detailed work was undertaken, 
all findings being recorded on catalogue cards. Each time a quadrat 
was examined an e timate? was made of the percentage of bare ground. 
Since there seem to be no published records of such studies in our moun- 
tains, it has occurred to the writer that a brief note on the subject would 
be of interest. 
The mountain park under consideration is a small glaciated valley in 
the Rocky Mountains at an altitude of about 9000 feet. The climate is 
cold, the July mean being about 56° F. Most of the park has a coarse 
soil of decomposed granite. Upon this is a xerophytic grassland vege- 
tation. In certain places, however, particularly at points along the 
margins of creeks or ponds and in glacial sinks, a mesophytic grassland 
develops. This may be spoken of as “meadow.” Here the soil has a 
considerable amount of humus derived from washings of adjacent slopes. 
Of the 19 quadrats, 17 are in dry grassland and 2 in meadow 
The data presented (tables I and I) are arranged according to time 
of year. Although the observations were made in two seasons, no doubt 
they show normal conditions, since both years had about the usual 
precipitation and were not greatly different in temperatures. 
TABLE I 
PERCENTAGE OF BARE GROUND IN DRY GRASSLAND 
Sept. 1 
omine | Mazae, | Joneses | June, | Juiyss, | Joya, | Sets 
| Ne Seren | 75 60 | Use ah le ere 30 36 
Fate gy eee teas 60 49 oe ule 33 53 
TEE ohh ce ee 63 4a Pe ea 50 46 
ih ene 50 20 ee ea 13 20 
<a 6 whan a) ee a eee 60 55 Ree eran ce, Salle hiieras fo: 20 40 
VEO 3 ae 60 BG i oe ee 28 33 
eae ee 50 38 Bee Natl pe Ort 20 28 
Vike or ee 70 55 25 30 45 3° 
pe cpet ees 64 30 25 15 20 30 
Sek ye oie a eine ae 63 25 20 20 10 20 
Sedan vil 75 5° 32 50 - 
Pete ae es 50 are ele ey 20 1. Pee eees 6.7 25 
SiO. 60 40 20 10 15 20 
Ill So yee 10° ieee 20 25 
Bie rece Mae ey 60 ara uae 2¢ 25 ree Pee rer 
AVS ee oe GO eee ee 90. Se 25 5° 
AVES ee eo: fe 10° fe er 30 
Average....... 60 45 22 22 26 33 
2 Tt may be well to state that & new library card was taken sagen 7 for bogies 
quadrat study. The data e of 1913, 
lest the judgment of the observer at any time might be influenced by earlier records. 
