7 
62 Prof. Bartlett on the Comas and Tails of Comets. 
tinctions seem to separate it from some, at least, of the platinum 
metals, with which it is usually associated and ri 
Tuscaloosa, Ala., Nov, 1, 1859. 
Art. VIL.—The Comas and Tails of Comets; by Prof. W. H. ©. 
Barter, U.S. Military Academy at West Point. 
nature unchanged and strengthens with the diminution of dis- 
tance for a part of the approaching mass, and yet reverses 1t8 
character and. becomes repulsive for another part, in order to ob- 
faith in matters of science, and from such friends, can only in- 
spire doubt, and should yield the place it has too long coonpied 
