728 Recent Literature. [September, 
plates. It is devoted to a description of the first stages of the 
larva, the specimens having been hatched from the eggs at Beau- 
fort, N.C, It appears that the larva immediately after hatching 
is still quite rudimentary in form compared with the more active 
zoéa after it has cast its first larval skin, which occurs in from two 
to twenty-four hours after hatching. A second paper by Dr. 
Brooks is entitled “ Alternation of periods of rest with periods of 
activity in the segmenting eggs of Vertebrates.” 
HamLin’s Puysicat GEOGRAPHY AND GEoLocy or Mr. Kraapn 
—This little known and somewhat inaccessible mountain, is one 
of the grandest peaks in Northeastern America. Its isolation, the 
great height to which it rises above the surrounding country, the 
wild, savage desolation of its summit, the sharpness of its peak, 
the enormous chasm or rent in its side like the crater of a vol- 
cano, are features wanting in the White and Green mountains. 
Moreover it is of peculiar interest from the fact that during the 
glacial period its peak, like that of Mount Washington, probably 
stood above the ice sheets, while at an elevation of 4615 feet on 
-its sides, occur boulders of Oriskany sandstone containing fossils, 
as well as of fossiliferous slates which, in some manner unexplained, 
have been carried from the lowlands not many miles to the north- 
westward, apparently not much over 600 feet above the sea. Pro- 
fessor Hamlin’s account is full and detailed, and we are glad to 
know only preliminary to more thorough investigations. The 
excellent heliotype of a model made of the mountain, will be 
useful to future explorers and visitors to this wildest, most vol- 
canic-looking of our New England peaks. 
rofessor Hamlin, from numerous soundings in the lakes of 
the Ktaadn region, shows that the lakes are shallow, with flat 
bottoms, enclosed by glacial detritus, as are all the lakes in 
Maine. Of lake basins excavated in solid rocks, he knows 
Not an instance in Maine. It would seem from this that the lake 
basins of Maine, though our author does not say so, would, 1 
drained, appear like the ancient lake bottoms ‘which form the 
sites of many a New England village, and which were formed 
during the terrace epoch or epoch of great rivers, when the latter 
were chains of lakes, 
The author shows that the Ktaadn region is not a continuous 
granite area as formerly supposed, but that like the other eleva- 
tions in Central Maine, it is a mass of intrusive granite rising 
out of gneiss. He takes the ground, against Sterry Hunt am 
others, that the “ gneiss” is really an eruptive granite, rather than 
_ of sedimentary origin, the transitions in many places within 2 
Va ponen j A taudn and 
the adjacent district, By CE Hasta tle Te eeu ot Comp. Z20k 
at Harvard College. Geological series, Vol. 1, No. v. Cambridge, Mass. 
ogy at 
ad 8vo, pp. 189-223, with a map and heliotype taken from a mod 
aadn, 
. 
el of Mt. | 
