316 Scientific Intelligence. 
ocean one foot; and a mile of ice, 200 feet. The other mile of ice 
melted is balanced by the abstraction of water to add a mile of ice 
to the Arctic. These numbers added, says Mr. Croll, give 485 
feet for the amount of submergence that would be thus occasioned 
at the North Pole, and 434 feet for that in the latitude of Edin- 
burgh; or if the ice had twice the supposed thickness, the amount 
of s submergence would have been twice this amount. 
The facts from Eastern eed cpg do not appear to favor . 
Mr. Croll’s conclusion. The amount of subsidence indicated by 
raised shell-beds on the St. taterencé ‘ Monty eal, near latitude 
45°, was about 500 feet; on the coast of Maine, near latitude 44°, 
only 200 feet, when it ought by the theory to have been but a few 
feet less than at Montreal; and along the southern shore of New 
England, near latitude 41° , only 50 to 100 age the larger of which 
numbers is much less than 'a fourth of what the t theory ayer 
It seems hence to follow that the curve of submergence did n 
ocean’s surface by a change of the center of gravity. 
The Coral Island subsidence over the Pacific, which affected a 
change of water level during the Quaternary age, as well as in 
earlier time, resides in the crust itself. The facts {a the shell 
beds of the St. Taviehoe and the coasts of New England appear 
to be equally evidence of a bona fide subsidence, which no Oe 
ss a ocean as a whole will account for. J. 
; t Changes of Level on the oa of Maine, with refer 
ence tae Hbchase al relation to other similar changes ; ; by N.5. 
SHALER. (20 pp., 4to, 1874, from the Mem. Bost. Soc. Nat. Hist., ii, 
322. )-—The Geibtes of the chan nges of level here discussed was 
gathered from the Quaternary deposits of Maine and of the coast 
south, Professor Shaler concludes eee the evidence sustains the 
ward, after “the first division ‘of the Glacial period res snd i at 
subsequently there was “a return of the ice in the shape of a set — 
of local glaciers which covered the shore at Mt. tn _ along 
most of the territory at least as far as New Brun and per- 
sisting until the final re-elevation of the land to viene 24 vrevet 
vel.” 
"Phe cause of the depression is discussed in the closing pages. 
He remarks that the only hypothesis as yet advanced to account 
ur. Sci., ae xxii, 346. The same iy is involved in his earlier 
paper in 1846, 1847, 
