W. Upham—Work of Prof. H. C. Lewis. 155 
arrangement of the coal-fields, but the north-west part of the cross 
is interfered with by the Lake District dome, and hence the Cambrian 
coal-field is of small dimensions as compared with that of Newcastle. 
Whilst the widespread movements which caused this cruciform 
arrangement were proceeding, a local movement has produced the 
asymmetry of the north-west portion. To what is this local move- 
ment due? Can the comparison with the laccolitic structure be 
carried further, and may we suppose that a lenticle of igneous rock 
lies at some depth below the Lower Paleozoic rocks of the Lake 
District? The evidence on this point is wanting. Most of the 
igneous rocks which penetrate the Lake District slates appear to have 
been intruded before the formation of the Carboniferous deposits, 
and the latter are remarkably free from igneous intrusions. ‘Those 
which do occur are of a basic character. 
The existence of the Whin Till indicates the occurrence of 
large masses of basic rock at a lower level, and it might be com- 
pared with one of the outlying sheets of the Henry Mountain 
laccolites. But the position of the igneous masses with which it is 
connected are not easy to fix, and the rocks of the Lake District and 
the surrounding area do not exhibit the abundance of basic dykes 
which one would expect in the vicinity of a laccolitic mass. There 
are a few dykes in the Carboniferous rocks of the Whitehaven district 
and near Ulleswater, and another dyke pointing to the Lake District 
is mapped by the geological surveyors in the Carboniferous rocks of 
Caton Green near Lancaster. Near the centre of the dome are several 
radial and tangential basic dykes, as seen in the geological map of 
the country around Wastwater, and these dykes are newer than the 
numerous acid dykes which cut through the same rocks, for they 
displace them. We may be allowed, then, to suggest the possibility 
of a mass of basic rock underlying and connected with the formation 
of the Lake District dome, without in any way insisting upon its 
probability. 
Be this as it may, the superimposed drainage of the Lake District 
appears to be an actual fact, and the occurrence of this is an 
interesting point in the fascinating study of the physical history of 
this beautiful and remarkable area. 
TiJ.—Tue Worx or Pror. Henry Carvitt Lewis In GLACIAL 
GEroLoGY. 
By Warren Uruam, of the United States Geological Survey. 
\HE recent notice! of the life and work of Prof. Henry Carvill 
Lewis, whose lamented death occurred in Manchester, July 
21st, 1888, in his thirty-fifth year, well indicates the wide range of 
his scientific labours. He published valuable results of investiga- 
tions in astronomy, mineralogy and petrology, and especially in 
glacial geology, the last being based on his exploration of the drift 
1 This Macazinz, III. Vol. V. pp. 428-430, September, 1888. A similar but 
more extended notice, with portrait, appeared in the American Geologist for 
December, 1888. 
