IH2 77?e Amen'cfDi Geohxiisf. March. 1895 
which in a few days afU;r liis arrival \\r suci-umbcd. All iiis mauu- 
scrijjts and field notes, in accordance witli liis d\ iii<i' re([uest, were 
placed in the hands of his generous adxcrsary, Dr. Crosskey. who un- 
di-rtook tli«' onerous task of editing' them. liow well he performed this 
friiMidly office will be seen by a i)enisal of the sixty-seven paji'es of int ro- 
(hiction which he contributed to tlie work before us. 
To fit himself for his undertaking. Dr. Crosskey visited the wonderful 
series of drift sections displayed during its construction in the course of 
the Manchester ship canal, and with the assistance of some local geolo- 
gists made a careful scrutiny of sucli as seemed likely to throw light upon 
Lewis' work and his great deductions, with the striking result that in 
(die important particular he became a complete convert to Lewis" views. 
On page Hi he says: 
"Moreover many of the beds, although not all. within the IdO to !.")() 
feet level, which contain marine shells. Prof. Lewisattributed to the ac- 
tion of a great glacier which filled up the sea — as, for example, the 
Irish Channel — and, travelling onwards, tore up the sea bottom in its 
l)assage and distributed the material so derived over the land. \ re- 
markable proof that Professor Lewis was right in this account of the 
origin of at least .vf>w/M)f the shell-bearing boulder clays found at low 
hsvels has been given by the excavations recently made for the purpose 
of constructing the ship canal between Manchester and Liveri)ool. .V 
series of boulder clays and sands has been brouglit to light, in which 
the boulder clay resting immediately on the basement rock contains 
both (1) material derived from the rock beneath it; (2) material fi-om 
the sea bottom; and (3) material brought from distant mountains. 
Fragments of local rock have been torn ofi" and imbedded in the boulder 
clay resting upon it. The basement boulder clay, as well as the super- 
imposed boulder clays and sands, contains marine shells in a nKtre or 
less broken and fragmeidary condition .\l the same time 
there are extraordinarily clear proofs that the ice (to which alone it is 
possible to assign the formal ion of these l)oulder clays) was in niolinn 
;ind pressed onwards from the northwest towards the southeast. . . 
1 have examined the ship canal sections, ami can cdine to no 
other conclusion than that the boulder clays, and at lejist a part of the 
sands, are the results of the morcment of a great glacier which came 
<lovvn from the northwest into the Irish sea, carried the debris it there 
accumulated over the plains of Lancjishire and Cheshire, and mixed it 
with locally derived material 'V\u\\ a nhtcirr Iiks (■(•rtaiiihi 
acted upon the surface of the lord/ rock api)ears to me prosed. The l)<)un- 
daries and the depth of the glacier, not its existence, are, 1 thirds, the 
(piestions left for determination The many (|neslions which 
are involved in the \arious theories concerning the elesation and de- 
[)ression of the land cannot all, however, be solved by the fact that fos- 
siliferous boulder clays and sands can be and have been formed by gla- 
ciers advancing from the sea." 
This extract will show the generous and truly scientilic spirit in 
which the editor discharged hisdut\. itut it was not granted him to 
