616 CORRESPONDENCE, ETC. 
near Rio Janeiro. It is evidently from this source that much of the soil 
and fine material of the drift of Iowa and Minnesota are derived. New 
England did not derive such a soil from her granites, although they con- 
tain all the elements of good soil, because their texture did not allow of 
their ready disintegration, ie the glaciers were passing over them, as 
those of Minnesota did. us the great superiority of the soil of the 
North-west over that of a England, is due to the fact that the rocks 
of the whole region—granites, sandstones and limestones—were more 
easily disintegrated and ground. — C. A. WHITE. 
ee en 
ANSWERS TO CORRESPONDENTS. 
W. C. F., Eastham, Mass witches,” which ad say is the common 
name for them with you, i s probably the Lepisma saccharina Linn. It is found in 
damp houses, in closets, among books, and is injurious to silks tapestry, 
we are informed wy a amig pein in Salem. You write “that they seem to choose th 
darkness, and oom to another by nig k moke basher, that had 
rprised o find the Lopisma acenso of fice weak bo bes pee an 
ody, 
———, Portsmouth, F query whether the Greenland 
Sa: a is a var ety of S. Pens ylvanic ag seit amd A we pa guess at 
iaaa or any Sehor A neid (or say oth pee past at all for that matter); there 
are too many - che em to Sg aii A 3 A pronon 
L. A.M., Falls, pilars a an the young of Papilio Asterias, th 
Parsnip Battari. The v- shaped” Kanai maiade out from behind the head, are sap 
posed to be organs of protection 
Richmond, Ind., writes that “ on Monday, = 27th of April, 1868, the ein 
pri on fresh, 
and when I killed it, it appeared as ae ive as of lone it hed: a pinn ay of go ravorite = 
Is it natural for them to destroy themselves if kept in confinem pE maT 
is its n a aoa p 
The Loa and other moths of the Silk-w ‘amily (Bo mbyoliz) do not 
jus ‘which are obsolete. though oli deveto Ak in the caterpillar. Did hes your oe ana 
eak off her tail, and did not the fragment op ay es ng 
chron which in o y winged ; pri is not adapted for swallowing, as she on only lives 10 
o through a brief courtship and lay her eggs for her 
m — ang : ng the few days of her pn. Mare tah The res aterpillar feeds on the map 
in a 
BOOKS RECEIVED. 
Observations on the Metamorphosis of Siredon into Amblystoma. By Prof. 0. © 
Marsh. With a plate. New Haven, 1868. 8v0, pp. 12. ff M. os 
Outlines of Compara ra hg and Medical Zoéiogy. By Harrison Allen, 
The n E 
sd atirat ey I, No, 4. November, 1968. 
The Pula. October storm November gg stoped 1968. 
Synopsis of the Birds of South y; arting T “Elliott Coues, M. D. Boston, 
8vo, pp. 23. 
American Bee Journal. December, 1868. S 
Report on the Trials of Plows, held at Utica. ' 1808. 8vo. 
Land and Water. sn ro 8 tag October 31, 608.) From 
Some of California. By J J.G. , M. D: i 
the e Proccedings of the Cs California Academy of Science, January, 1868.) 8vo, PP- 
Cosmos. October 3 to November 1 14, 1 1868. Paris. 






