stroyed. The films ABba and ‘A’B’b’a’ were kept in a liquid or sem 
liquid state by the heat communicated to them by the perfect water be- 
yond. That is now removed, and the film in question has ice colder than 
itself on both sides. Part of the sensible heat it possesses is given to the 
neighboring strata which have less heat than itself, and the intercepted 
film of water in the transition state becomes more or less perfect ice. 
Even if the second surface be not of ice, provided it be a bad con- 
ductor, the effect is practically the same. For the film of water is rob- 
a : 
provided they are prevented from conveying heat by surrounding them 
with ice. Thus, as has been shown, metals adhere to melting ice. 
Il. GEOLOGY. 
1. Tertiary Basin of White and Niobrara Rivers ; by F. V. HAYDEN, 
M.D., (Proc. Acad. Nat. Sci., Philad. June, 1858),—In a former papert 
I gave a vertical section of the different beds of this basin as far as th 
were known at that time. During the past year, many additional facts 
and a large collection of new organic remains have been secured, W ich 
enable me to present a section more accurate and complete. It will be 
at once apparent from the list of localities for the different beds, how ex 
__ tensive a geographical area this basin occupies. 
Vertical Section, showing the order of superposition of the different beds 
i o 
he of the Tertiary Basin of White and Niobrara Rivers. 
I incline to think that water, in these 
lee, hav perature somewhat 
