458 W. J. McGee—Crania of the Mound-builders. 
in which de denotes the increment of the intrinsic energy in 
the apparatus, 77 the increment of entropy, de the quantity 
of electricity which passes through it, V’ and V” the electrical 
potentials in pieces of the same kind of metal connected wit 
the anode and cathode respectively, dW, the work done by 
gravity, and dW, the work done by the pressures which act on 
the external surface of the apparatus. The term dW, ma 
of heat which M. Favre has in many cases observed in a gal- 
vanic or electrolytic cell, and by the fact that the solid or 
liquid state of an electrode (at its temperature of fusion) does 
not affect the electromotive force. 
Art. LIIL—On an Anatomical Peculiarity by which Crania of the 
Mound builders may be distinguished from those of the Modern 
Indians ; * by W. J. McGus, Farley, Iowa. 
* Read before the American Association for the Advancement of Science at St. 
