0 ne: ae ean ee 
A. Winchell on the Remains of a Mastodon in Michigan. 223 
This theory of the origin of terrestrial magnetism, as a part 
of the general theory of Molecular Physics, here presented, was 
brought, by the author, to the notice of the Connecticut Acad- 
emy, about two years since. It appears, from a pamphlet re- 
cently received by the editors of this Journal, that a theory quite 
similar to this was propounded several years since by Gustav 
Hinrichs, of Copenhagen. The theory of Hinrichs, or one hav- 
ing the same essential features, I find is advocated by Prof. 
Challis, in the Number of the Philosophical Magazine published 
in February, 1861 
[To be continued.] 
Art. XXIII.—Notice of the Remains of a Mastodon recently discov- 
ered in Michigan ; by Professor ALEXANDER WINCHELL. 
Adrian. The bones thus far discovered consist of the cranium, 
With the exception of the nasal bones; five molars, four of which 
lack their roots; the terminal portions of the two tusks, each 
Were a little the deepest in the mire. It is stated that man 
ars ago this spot was known as a “ deer lick. 
