132 BOTANICAL GAZETTE [FEBRUARY 
33, T. 67 N., R. 33 W.) is shown in fig. 25, and the extraordinary 
likeness to the shore illustrated in fig. 24 will at once be evident. 
An especially interesting feature of this locality is the fact that 
just below the opening and extending to the water’s edge of Tobin’s 
Harbor is an area of climax forest of unusual beauty. The explana- 
tion of this is found in the physiographic history of the island. 
When the area of the present rock opening was actual shore the 
waves of the open lake broke upon it. As the water level subsided 
the ridge of Scovill Point appeared, affording full protection to the 
Fic. 25.—Rock opening on the southeast slope of the Greenstone Range near 
Tobin’s Harbor: when Scovill Point (right, in the distance) was submerged, this was 
a shore area exposed to the open lake; note likeness to fig. 24. 
new shore area along the northwest side of Tobin’s Harbor. Upon 
this latter, protected from both waves and wind, and receiving all 
the soil materials washed down from the slope above, invasion went 
on rapidly, resulting in the speedy establishment of the climax forest. 
The area higher up, exposed to the full force of the winds sweeping 
in from the lake across Scovill Point, still lingered in the early 
stages of the succession. 
QuapraT 7 (fig. 26) was located in the large rock opening 
described above. The likeness is so great that it may be taken 
also as representing shore conditions of type B. The surface of the 
