C. Whitilesey on the Dissolution of Field Ice. 111 
To the metals belonging to the group Ti, Ta, W, V, Mo, Te and No; Sn 
belongs also to this series as well as to the first. 
To the platinum group, Rh, Ru, Pd, Pt, Ir, Os. 
To 6, B, Si. 
AL Zr. 
The differences between Cl and Br, Br and I, approximate to the same 
r, as likewise do the relations between Li, Na and K, and be- 
tween Ca, Sr and Ba. 
This relation, therefore, extends to no less than forty-eight ot 
the elementary bodies: to all except those as yet imperfectly 
understood, most of which may yet range themselves under the 
same law, and except the oxygen group, oxygen, sulphur, sele- 
nium and tellurium, substances which stand alone and unmis- 
takably apart from the other elements. 
Philadelphia, Nov. 10, 1859. 
Art. XIV.—Remarks on the Dissolution of Field Ice; by Cas. 
Wuirtt.esey, of Cleveland, Ohio. 
THE interesting paper of Col. Totten, U.S. A., in the November 
number of this Journal for 1859, upon the rapid disappearance 
of ice in the northern lakes, recalls some observations that I ha 
a2 opportunity to make on Lake Superior a few years since. 
On the 8th of March, 1855, the inhabitants of Eagle River, a 
Village in Haughton County, situated upon the most northerly 
Part of Point Kewenaw, were engaged in procuring ice for their 
summer use. The severity of winter in that latitude (47° 22' 
ries had so far relaxed, that the surface of the field was 
beet porous from the direct action of the sun. There had 
no rain; the atmosphere was clear and cool, but on the 
“nny side of houses and other objects the snow melted rapidly 
a 
ow the soft and moist surface, nana Bh 
MN aN ik | 
Ne 
WY \ I AN \ \\\ 
Block of ice 30 inches thick. 
aa, upper surface, 
Which the 
i taken about 1000 feet from the 
ore, - 
a —-ihaemeatl 
eee tg 
