

560 ANSWERS TO CORRESPONDENTS, ETC. 
coast, and in the purer waters of the open gulf. These islands, doubtless, 
at the epoch of the building of the mounds were of smaller extent, and 
formed a less ee bar to the approach of pure sea-water to the 
coast of the ma 
Major ini then gave a brief account of his recent exploration of 
1 U 
e 
Dr. Durham exhibited under the microscope the tongues of several 
species of aquatic gasteropods found in the vicinity of Chicago, and de- 
Scribed the habits of the animals. 
ANSWERS TO CORRESPONDENTS. 
S. M., Wading River, N. Y.—Your plant appears to be Epiphegus Virginiana Bart., 
edat as Beech- UM or Cancer-root. It is ce ace im except in the shade of 
beech woods, where it is usually common en — will be interesting to note 
whether you found t under this or some other tree, i "ii is supposed to be parasitic 
on the roots of the — ch o e This species is "E. Americana Nutt., and there 1S, 
another related plant known also as Cancer-root, and found under the oa cy —C. M. T. 
W. W. B., Indianapolis, Ind.—Your No 9 is Pteris critica variety Lum oe No. 10 
is Pteris serrata; the fertile frond, No. 11, is Adiantum pubescens.— J. L. R. 
; Decatur, og To form a satisfactory geo geen upon your oak from th 
eave i i 
acorns, and a tieu e Leg thet they ripen the first pe which is a very 
important character. e size of the tree, ana Le nature or ite bnt Bi as wee p u 
land, would be valuable criteria. In the abse of these facts, we should suspect, If 
the fr Bele ripens the first year, that it was a ned peculiar perhaps, s, of Q. castanea, Willd. ; 
or, possibly, it may be 'Q. monticola, Mx. If the acorns remain over, then it may bea 
hybrid, as you suggest; iud perhaps -— peir . tridentata, Kopan though — 
we should doubt. The Pen of thes ral rre ng is very interesting, à 
deo commend you to make your Noc reaenien y as careful ànd comprehensive as 
— Qe 
BOOKS RECEIVED. 
ions of the American Entomological Society, Vol. II, No. 2. October, 1869. Phila- 
delphia. 
Popular Science Revi: No. London. icke. 
pepeo Memoranda Ting 4, pos a yos puts 0f Stas pose Tampa Bay, Florida, By 
R E. C. Boston, 
Land a 
Le Naturalist Ca radien, Quebec, dat uty, 1869. 
Journal for the Popular Diffusion of Natural Science, Vol. I, No. 3, 4, New Ser. Copenha- 
. Canadian Naturalist and Quarterly Journal d Science, Montreal. Mareh, 1869. $3.00. . 
Monograph of the genus Niso. Ato. 0, pp. 2; with a plate, 
anainte Report of the Michigan Board of 4 Lansing, 1968. 8vo. 
um Catal Species and Varieties * recent Mollusca, described prior to Jan. l, 
1867, Part. nidæ, Amphiperasidæ, Roberts, Philadelphia. Pabnehed bf 
Ss Oruenaisyioai Section of the Academy of Silia Seienees, Nov. 1869. 8vo, pp. 189-214. 
American Bee . Nov., 1869. 
ture, 1868. 
ud LE 1809. 12mo, pp. 307. $2.00. 
3245 
and Quantitative Chemical Analysis, Edited by G. C. Caldwell, New — 
xu RADO St deed ag 
EEUU er e RE or eSI o PUTET a CREME ELE 
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