- 47 - 
densis (L.) Medic. 
A few dwarfed specimens of white pine ( Pinus Strobus ) 
are scattered along the summit, but the species is much 
more common over the crest of the ridge (fig. 24), where 
it receives more shelter and moisture. The gray pine ( Pinus 
Ban Asians Lamb.) was noticed at only one point. 
The limit of forest growth is bordered by a very dis¬ 
tinct transitional zone all along the summit. The general 
character of this is shown in fig. 28, but it varies a great 
deal in composition at different points of the ridge, ap¬ 
proaching more mesophytic conditions at lower elevations. 
Gnarled and stunted specimens of red oak ( Quercus rubra L.) 
are mingled with aspen ( Populus tremuloides Michx.) and 
white birch ( Betula alba L. var. papyrifera (Marsh.) Spach.), 
the latter sometimes appearing in almost pure stands. 
(c) Quadrat studies. 
A detailed study of the transitional zone was made 
at a point in sec. 14, just west of the saddle (see map). 
This is typical of most of the ridgo. Beginning at the 
area of bare rock surface shown in fig. 29, situated 
approximately 25 ra. bacA from the face of the cliff, a 
series of four quadrats was taken in succession, the last 
being in the mesophytic forest (fig. 50). These quadrats 
were 10 ra. square, making the total width of the transitional 
