Northern Drijt from the Rocky Mountains. 319 
. H. Dall, the gentleman referred to in the foregoing extract, 
(and well known to the readers of this Journal as one of the 
from what he had seen of the west coast, th et unproved, 
was that the glacier-field never extended in these regions to the 
westward of the Rocky Mountains, though single glaciers have 
existed and still exist between spurs of the mountains which 
approach the coast. No boulders, according to Mr. Dall, such as 
are common in New England, no scratches or other marks of 
ice action had been observed by any of his party, though care- 
fully looked for. 
marks which follow, and I do so with extreme diffidence, know- 
ing well from old experience the care and caution with which 
Prof. Whitney has proceeded in his remarkable geological sur- 
vey of California, as well as in his earlier work on the shores of 
Lake Superior. For this reason I will speak only of what I 
know from personal knowledge of the districts visited by myself, 
calling in, however, the observations of others as corroboration 
of my statements. 
As far as Alaska and California, and even Oregon and 
Washington Territory, are concerned, I must leave the ques- 
tion of glacial remains within their boundaries, to observers 
other portions of the Pacific coast will hold equally goo negeee 
ee g 
whole of Vancouver Island I am very intimately a uainted— 
perhaps more intimately than any other single in vidual— 
and can speak positively regarding the marked presence of 
true Northern Drift there, so that with every respect to the 
opinion of so distinguished a geologist as Prof. Whitney, I am 
compelled to dissent from his theory regarding the entire ab- 
sence of glacial remains proper, from the Pacific slope of the 
Rocky Mountains. 
