Man and t hi' GlariaJ f*eHo(f. — Sfilishnr;/. \h 
aiitlior says (p. 04) tlial tlu' dniinlins of central New York "arc proh- 
ably remnants of a inorainic accmniilaf ion wind} were made diirinj,^ 
a pause in flic first advance of tl:c ice. and wcr-c linjiily sculptured 
into their ])resent shape by the onward nio\(Mnenrof iheice." Tliis 
view concerning;- the ori^^n'n of certain drum h'ns was su^j^ested ( hy 
Hitchcock, \V(^ Ixdieve) many years since, hut we are nol aware that 
it lias found general acceptance. The i)ecuiiarly eionj^ated character 
of the New York drumlins, quite unlike the "clio|)py" I'oi-m of morainic 
hills, would seem to mak(Mhis notion of llieir origin less applicable 
to the <b'umlius of central New ^'o|■k than to those of any other re- 
j^ion. Siu'ely the author is not consistent in accepting' !>a\is" idea of 
drumlin oi'i^'in. which distinctly makes them constructive forms. ;ind 
in acce|)tinfi- also this otluM- idea, which as distinctly makes them 
destructive forms. 
On p. 1(H), the iiitcrhilKili- moi-aines which ha\e lieen so cai'efulh 
differentiated from otiier forms of terminal moraines, are referred lo 
as "a sort of medial moraine." If i'rof. W'riglit's detinit ion of medial 
moraines on j). i] be rij^dit. and we think it is. these interlobate mo- 
raines aT(^ not in any sense medial moraines. They are l< rmiii'i/ ti) 
two ice lolx's alonj;- their line of meetinJ,^ and are, llin-rfurt'. liitii'luhate 
and iiiit ill fiin/ xi'iisf ^' iiic(lii(l." 
It seems to us unfortunate, too, that at a sta^'e in the development 
of ghiciolo^'-y when kames and eskers arecominu; to lie dilferent iated, 
that tliey should be cdassed tofjcthei- in a book which purports to be 
up vvitli tlie times. These two drift forms are no doubt somewhat r»>- 
iated, and the one may locally run into the other, but the types, as 
sucl), seem reasonal)Iy distinct. 
We are com])elled to dissent from our author's statements ( pp. 89, 
see also pp. 84-85) to the effect that in passini; over a re.yion fui-i-owed 
by valleys, the ice .should extend further fi-om its orif^in on the eleva- 
tions, than in the valleys. We are nol familiar with the facts in 
Pennsylvania, l)ut in all regions with which we are familiar, the ice 
went further south in the dei)ressions than on the uplands, and we 
do not see how any otiier condition of things could l)e possible, as a 
general fact. 
To the statement (p. ()!)) '"it should always 1h' borne in mind that 
they [glacial stria-] represent the work done during t he closing stages 
of the [ice] period," we also take e\ce|(lion. It seems certain that 
stria* made when the ice lirst invaded a region might ejisily becom(> 
buried by drift, so as to be preserved indelinitely. 
It is to be regretted that a volume w liicli has the connnernlable pur- 
pose of setting forth in popular form the results of glaciology to date, 
should lay so much stress upon tlu^ unity of the glacial |)eriod. If 
Prof. A\'riglit believes there was but one glacial epoch during tin; 
glacial period, h(^ has a right to his belief, which no one will dispute. 
But since the aim is to set forth the present condition of opinion, it 
would have been better to have indicated that the view advocated in 
the vohmie is the vii.'W of the minority of those competent to form 
