180 Rhodora [SEPTEMBER 
data than exists upon herbarium-labels, the conclusions above reached, 
the writer has listed all the stations known to him, either from speci- 
mens or authentic reports, in arctic and subarctic British America, 
for fifteen of the more typical plants of the alpine districts of New 
England, New York and eastern Canada. In this work he has been 
greatly assisted by the map of Arctic British America and the accom- 
panying notes published by Dr. G. M. Dawson.* In order to make 
the test more valuable the fifteen plants whose ranges were thus 
studied were selected equally from those of the three groups above 
tabulated. All together 55 stations or definite regions for these fifteen 
plants have been found. Of these, 7 are either not indicated on avail- 
able maps or are too vaguely stated on the labels to be of service. 
The remaining 48 stations are listed in the following tabulation, and 
in each case the rock of the region, which could furnish the soil-ele- 
ments for which the plants show distinct preferences in New York, 
New England, and eastern Canada, is noted. 
TaBLeE III. 
SHOWING THE KNOWN STATIONS OR REGIONS, FROM NEWFOUND- 
LAND TO ARCTIC BRITISH AMERICA, FOR 15 ALPINE PLANTS OF 
New York, New ENGLAND AND EASTERN CANADA. 
z EIE: | 
Ta o/h] 
Group I (Plants which, south of the St, Lawrence, are = i E | = 
controlled in their Distribution by a Preponderance $ls|/E| Sk 
of Potassium in the Soil.) a|S|S|B|R 
z [: EET 
S 8ISICIZ 
Stations, and Rocks of the Region from which Potassic &ixi3|2|$ 
Soils could be derived, E | g| 5 3 | = 
Cape Ray and Channel to White Bay, Newfoundland (Ar- | 
ON 9. 10 X ll... re un + + 
Despair Bay to Fogo Island, etc., Newfoundland (Archaean D J++ | -F 
Southeastern Newfoundland (Archaean +) ee | a |+|+ 
Baie Ste. Claire, Pointe-Ouest, ete., Anticosti(granite, gneiss?) |-- | i+ + 
North shore of St. Lawrence from Cap à l'Aigle to Bradore Er] 
Bay, Quebec (granite, gneiss *) (09 4 r eE 
Red Bay, Labrador ST a, T | | + 
Sandwich Bay, Labrador (syenite®) . . . . . , . .. t| 
St. Lewis Inlet, Labrador (syenite, gneiss% . . . . . . | + M 
* Geol. and Nat. Hist. Surv. Can., Ann. Rep. n. s., ii. pt. R (1887). 
