310 GEOLOGY. 
infer that your mouse is of the ordinary color. I may 
at me risk of telling you something you know already, fey 
is ind of hiccoughing mouse ; I also had one of these, 
sein one day on an exploring expedition i in the wilds of a desert 
ed rubbish room, he was lost, night overtook him as 
to death. 
the Maryland Academy of Science, & propos of Dr. Lockwe 
recent article, which, like everything else he writes for the Na 
RALIST, is simply delightful. The whole subject is interesting. 
lating the voice as to produce musical notes, though the faculty 
be only occasionally exercised? Birds themselves, as a rule, st 
chiefly under the special stimulus of the breeding season. * 
vocal music having been generally, but perhaps too hastily 
posed to be confined to birds more information is desirable. 
can contribute something ?— Exriorr Coues. 
Tue Music or tur RATTLESNAKE. — I have nothing to $ 
reference to Prof. Shaler’s theory of the use of rattles to the 
but while botanizing over the marshes of Michigan during the pest 
few years, I have had a chance to become familiar with the 
of the rattles of the Massasauga. It is so much like the 
of some grasshoppers that I have often mistaken the sound 
insect for that of the serpent. — W. J. Brat, Mich. Agr. 
MEeLanism. — Noticing what Dr. Wood says, in the last 
of the Naturanisr, about “ melanism,” it occurs to me to § 
black woodchucks are found in this region and in Washi 
H.; and I have had a perfectly black pm from 1 
Sanzorn TENNEY, Williamstown, Mass. 
GEOLOGY. 
Gracers 1N THE Rocky Movuntarns.— In the Na soa 
February, in an article on ‘The Mountains of Col 
_W. Foster denies the existence of any evidence i : 
former presence of glaciers in the Rocky Mountains- a 
that so far as he observed none of the rock surfaces ad 
and striated, and that those accumulations of sand ame 
the nature of terminal moraines are entirely wanting. 
With regard to the existence of terminal moraines 
