4 
7 : %s 
200 Bibliography. 
labors of England, Scotland, and Ireland, and the. mene re- 
- searches that are in progress in this country. 
Mr. Murchison tales honorable notice of the labors. of- Mr. Lyell 
among us, and of the e co-operation of American geologists with him in 
‘earrying out his personal review of the great features of our geology. 
‘We must, however, find room, in the very winding up of our number, 
for adding, that Mr. Murchison has reviewed, with a faithful severity, 
the wide extension attempted to be made of the beautiful glacial theory 
of Agassiz, so splendid and satisfactory in its application to the Alps, 
and to all other regions where glaciers exist, or can have existed.in 
past ages. This great subject, and with it that of drift and bowlders, 
the President discusses with his accustomed ability. and. independ 
and prescribes some wholesome restraints to those. whose. nmginatons 
aa allure their judgment to unsustainable conclusions... 
We are not willing, however, to omit the. following . citation, sail 
which we shall conclude our notice : 
“The other point to which I allude, oak eae at once on this 
view, is a discovery which our librarian has just made without quitting 
the apartments which he so truly adorns. In the American Journal of 
Science for the year 1826, vol. x, p. 217, Mr. Lonsdale has: detected a 
short, clear, and modest statement, entitled ‘ Remarks on Bowlders, by 
Peter Dobson,” which, though little more than one page in length, con- 
tains the essence of the modified glacial theory at which we have arri- 
ved afterso much debate. First describing in a few lines the manner 
in which large bowlders, weighing from ten ewt. to fifteen tons, were _ 
dug out in clay and gravel, when making the foundations for. his own 
cotton factory at Vernon, and seeing that it was not uncommon to find 
m worn, abraded, and scratched on the lower side, ‘as if done (10 
use his own expression) by their having been dragged over rocks and 
gravelly earth in one steady position, he adds this most temarkable 
sentence: ‘I think we cannot account for these appearances, unless we 
call in the aid of ice as well as water, and that they have been worn be 
being suspended and carried in ice over rocks and earth under water? 
To show also that he had read much and thought deeply on this sub- 
ject, Mr. Dobson quotes British authorities to prove, that as ice-floes 
aha, carry huge masses of stone, and deposit thern at great dis- 
