Dmnili/is in Glasgozv. — UpluDii. lyj 
a half to two-thirds as great width ; and in their altitude, which 
is mostly from 50 or 75 to 125 feet above the contiguous lower 
ground, while their extremes range from 30 or 40 feet up to 
about 150 feet. 
None of the drumlins of Glasgow are extremely elongated 
and sharp-crested, like some in the Central New York district, 
and like the ispatinows described and so named by Tyrrell in 
the north central part of the Dominion of Canada, west of 
Hudson bay; nor are any of quite circular area, like the mam- 
millary drumlins of some localities in WisconEin, as described 
l)y Chamberlin. From whatever point of view they are seen, 
the Glasgow hills rise in the graceful rounded forms which 
suggested to Hitchcock the early name, "lenticular hills," ap- 
plied to them in the third volume of the New Hampshire Geo- 
logical Survey. 
These hills, hitherto unnoted by geologists or mentioned in 
the briefest terms in papers treating of other portions of the 
geology of the region, are, I think, the first drumlins definitely 
mapped in Great Britain; but in the lar-Connaught region ot 
Ireland, somewhat more elongated drumlins, occurring in 
great numbers, were mapped so early as in 1872 by Kinahan 
and Close. It is to be hoped that the Scottish and English 
drumlins will soon have equally elaborate mapping, that their 
general distribution and grouping may be well known, lead- 
ing probably, with the smiilar studies made in America, to a 
gccd agreement among geologists in their explanations of 
the mode of accumulation of these prominent smooth hills of 
glacial drift. 
Perhaps the most signiticant fact concerning drumlins is 
their gregariousness. Both in America and in the Britisli 
Isles, they are amassed on some tracts in great profusion, 
while other and much more extensive drift-bearing regions 
have none. On the great glaciated areas of continental Eu- 
rope, only very few and limited districts bear drumlins. Their 
most notable district was described by Keilhack, with map- 
])ing of the many drumlins, two years ago, on the east side of 
the lower part of the river Oder, in northern Germany.* 
*Jahrbuch, k. jireuss. genl. Landesanstalt, i8q6, pp. 163-188, with 
maps. About 2,200 drumlins are mapped by Keilhack in this district ; 
Init many of small size are omitted from his map. The whole number of 
drumlins in this district, which is 60 miles long from north to south and 
from 20 to 40 miles wide, is estimated at 3,000. Thev are mostly from 1=; 
to 50 feet high, but some attain bights of 80 to 100 feet. 
