Vill List of the Contributors, 
Sroxry, G. Jounstone, M.A., F.R.S. - : Pace 
Cn the Penetration of Heat across Layers of Gas. (Abstract), .  5i 
On some remarkable instances of compressed Crookes’s Layers or 
Compressed Strata of Polarized Gas at ordinary atmospheric 
tensions, : : . ; : : : : é 53 
WioeHam, Joun R., M.R.LA. 
On a gas-light improver ; also on a new form of gas engine, used 
with the Gramme Magneto-electric machine (verbal communi- 
cation, ° e ° e . . e e e e e 132 
N.B.—Datt or PUBLICATION OF THE SEVERAL PARTS OF 
VouumME I., New SrErikEs. 
Part 1, with pages 1 to 52, November, 1877. 
eUO » 63 to 132, May, 1878. 
yo as ,, 133 toend, November, 1878. 
