410 W. M. Dawis—Distribution of Drumlins. 
Auvergne. Moreover, the control] that drumlins exercise over 
the laying out of roads and the division of property is so com- 
plete in districts where. they abound, that it is the rule to find 
roads, fields, gardens and. even houses oriented in obedience 
to the march of the old ice invasion. About Boston, there 
are hundreds of dwellings whose walls thus stand in close 
parallelism with the glacial scratches on the bed-rock beneath 
them. In a recent number of Science, I have given several 
sketches of these drift-hills. 
Distribution—The absence of drumlins in non-glaciated 
regions confirms the evidence that gives them a directly glacial 
origin. When found, they occur either scattered about with- 
out apparent system, or crowded together in groups. The most 
extensive group of which I have a map is in northwestern 
Ireland, the district described by Kinahan and Close in their 
ol aath on the General Glaciation of Iar-Connaught, Dublin, 1872 
he direction of neighboring glacial strive is shown b arrows, 
which although not all parallel to one re hom are strikingly par- 
allel to the nearest drift ridges. These long drumlins “ consist 
of stiff unstratified bowlder clay, containing well blunted and 
scratched stones and blocks; they have been most unquestion- 
ably formed by the rock-scoring streams [of ice], since they are, 
them satisfactorily in descriptions of the drift of Scandinavia, 
Germany or Switzerland. Krdmann’s “ Exposé des formations 
quaternaires de la Suede”’ Se ceric 1868) may perhaps refer 
to drumlins on p. 24 . ns les plaines, ces masses de 
gravier (bowlder clay) s Pélbvens en nombre considérable des 
couches ‘argile environnantes, sous forme de collines plus ou 
moin grandes.” Desor did not include them as characteristic 
