168 CORRESPONDENCE. 

with these Pane he believed that, with the waning of the ice-period, 
began the era of primeval man. In the successive epochs of the ice, in- 
dicated by nk eai arieehs ice, we have a relative chronology ; when we ask 
for more specific pistomionts of age, we find ourselves at once at a loss 
for an answer. Som oa a might be seen in the abrasions of rocks 
of unequal hardness, ae instances were cited in illustration of this. he 
- In the course of the cho which followed these remarks, sot 
restr said he hoped for great results from the investigations now um 
dertaking in our own country, and believed that marks of the reinder 
would yet be found in the Carolinas 












a ANA 
CORRESPONDENCE. D 
J. H.F., New York. —There is SERAS - jse ork í 
- American Cryptogamic Botany. For w on ens, Sood 
the NATURALIST, Vol. I, p. 326. You ws ce the puree works of a 
Cooke, noticed in this Shan very useful. 
F. W. W., Concord, Mass.—There is no complete American weet 
Taxidermy. See, however, NATURALIST, Vol. I, p. 160, 
O. F., Needham Plain, Mass.—For works on American 
see Nirit Vol. I, p. 160, 441, day the last number ubscri 
to ‘The Guide to the Study of Insects,” which will be “abs in 
autumn, may be sent to us. 
L. A. R., Bucks, Ohio. — The specimen you inclose is a fossil £ 
Club-moss, Lepidodendron, which occurs abundantly in the shale i nelo 
ing coal-beds. Specimens from your region would be very ai 
The Kangaroo Mouse you speak of is the Jaculus Hudsonicus, an 
well known as inhabiting nearly all the United States. The SP 
Dipodomys, to which Dr. Coues refers in his papers in the NATUR: TURALIST 
“Kangaroo Rats and Mice,” are not known to occur east of the 
sippi. 
N. T. T., Bethel, Me.—The substance to which you refer is the 
water Sponge (Spongilla fluviatilis). It occurs commonly in ” 
and sluggish brooks and rivers of Maine, and southward. 

Tee 
ee 
BOOKS RECEIVED. 
and his Works. By Lewis H. vie ih 
Pian pee the a ti a Tann Jan. 30, 1868; r whi 
path — ‘Pran Progress of the og Survey, etc., e 
ney. San Francisco, 1868. 8yo. 14, 15, 14. 1868. 
Papers from * T American B Ria p y W. W. Ely. eres 
bigpinceri & Co. wap 46—77, goti ; l 
e Field. pep 4,21. London, 
Cosmos. February is, March 7. Pari 
American Bee Journ April. Washington. 
ee Hear 7 mi ‘ammals from Arizona. By Elliott Coues, M. D» 
Pp 
