■i-i The American Oeoiocjixt. juimiiry, isitu 
Avilli these the linricd rivci' clianiu'ls scciii to lie cnsicr to trace, 
tlu>ii<>;li, of coiii'se, atror(rni<i' less aeeiii'ate iiifoniiatioii. 
Ill tliis eoimectioii and as possihiy piTtaiuiiii;" to the u,'eiieral 
iiiteriiiacial hydrography of tlie (Ireal Lake btisiii. \ may perhaps 
mention the eoninion oceiu'reiice of waterworn pel)l)h's in tlu; 
drnniiins west of Syracuse, as tliese may very likely Ite derived 
from bnried shore-lines beIon(>ini>; to the same iiiterulaeia! lake as 
the interesting deposits east of Toronto. 
Finally I will emplitisize, that the pur[)ose of this {laix'r is mueh 
less to give an ultimate solution of the dirt'erent complex problems 
connected ^vith the continental changes of le\el. than to show a 
Avay by -.vhich, 1 think, such a solution can lie reached with as 
]ittl(> loss of time as possible. 
From the details already determined in North America as well 
as in Kurope, it is esident that the changes of level are closely 
connected with the local structure of the earths crust and with 
the local extension of the glaciations ; and thus it is conclusively 
shown that no changes wiiate\'er in the level of the sea can 
account for tlu- plienomenon. 
Notwithstanding all doubts as to the possiliilitv of vertical up- 
lifts of the great continental portions of the earth's crust, we may 
already be fully justified tousealiout this with a new meaning the 
Avell known words of (lalilei: '• Vet it does move." 
EDITORIAL COMMEI^T. 
TlIK r.MI' OF (}KOI.O(iir.\I, >r.\l'l'IN(i b'OR S'l'.VrK SlKVKVS. 
Keferring to the communication of I'rof. A\'iiislowon the -'Hig- 
ginsville sheet of the ^lissouri Sur\ey. " in response to a review of 
the same sheet in the Novemlier numlier of theGKor.ooiST (p. '>]7), 
inasmuch as Prof. Winslow intends that his statement of [irinci- 
ples shall l»e considered fundanu-ntally applicable to • -a general 
system of mapping of a state oi' nation," and thus to cover the 
subject, from his point of view, it seems proper that attention be 
directed to some considerations which are pt'rtinent but which he 
seems to have f(U-golten or to have misai)preliended — at h'ast to 
have misai>plie<I. 
Ill the lirst [tlace. although it miuht [lerhaps be inferred from 
