52 Rhodora [Marcu 
the Gaspé Peninsula and the literature bearing upon it the present 
writer has found absolutely no evidence of the Banksian Pine in that 
vast Silurian and Cambrian region, the only known stations on the 
peninsula being on the leached crests of some of the intrusives at the 
southwest corner of the peninsula, while farther west the pine reappears 
on the quartzites of Rimouski County. 
It is also noteworthy that along the north shore of the lower St. 
Lawrence, after “occurring abundantly” eastward to “the neighbour- 
hood of the mouth of the Moisie,” Pinus Banksiana should abruptly 
stop, for on the acid barren lands of northwestern Canada it extends 
north quite to the Arctic. Is it not significant, then, that in “the 
neighbourhood of the mouth of the Moisie” there should be a great 
mass of anorthosite 60 miles broad, and east of that another, for analy- 
ses! of 24 samples of anorthosite from different regions of Labrador, 
Canada and the Adirondacks, show it to contain an average of 9 % 
of calcium, the amount often reaching 18 95; and that east of these 
anorthosites lies the extensive limestone tract including the Mingan 
Islands and "the neighboring coast," for “a distance of forty-five 
miles," "the Mingan development of the Calciferous formation" 
having a thickness of 250 feet (see Logan, Geol. of Canada, 119- 
121)? 
In Maine there is not a single known station for Pinus Banksiana 
which is not on granite or the most highly siliceous of rocks. In New 
Hampshire the species is only on Welch Mt., a sterile granite mass 
south of the syenitic Franconia Range; in Vermont it *is one of the 
rarest of our trees" growing on "sandy, sterile soil; rocky slopes." ? 
Similarly in New York and the Great Lake States the Banksian Pine 
belongs to the most sterile habitats, and very recently Rosendahl & 
Butters have stated that in Minnesota and Wisconsin “The Jack Pine 
(P. Banksiana Lamb.) occurred most abundantly on sandy outwash 
plains . . . and in the great paleozoic sand plains." ? 
These facts and many scores of monotonously similar ones which the 
writer refrains from merely piling up are sufficient evidence that the 
BANKSIAN Pine is a pronounced oxylophyte. 
In spite of the fact that Pinus Banksiana is essentially absent 
from the great limestone region bordering the southwest side of 
1 Adams, Geol. Surv. Can. Ann. Rep. N. S. viii. 1305 (1896). 
? Burns & Otis, Trees of Vermont, 31 (1916). 
3 Rosendahl & Butters, Pl. World, xxi. 107 (1918). 
