TRANSACTIONS (NEW SERIES) VOLUME IL. 
(Already Published.) 
PART. 
1.—On Great Telescopes of the Future. By HowArp Gruss, F.R.A.S. (November, 1877.) 
2,—On the Penetration of Heat across Layers of Gas. By G. J. Sronny, M.A., E.R.S. (November, 
1877.) 
3.—On the Satellites of Mars. By Wintwortn Erox, LL.D. (May, 1878.) 
4.—On the Mechanical Theory of Crookes’s, or Polarization Stress in Gases. By G. J. STONEY, 
M.A., F.R.S. (October, 1878.) 
5.—On the Mechanical Theory of Crookes’s Force. By GrorGE FRANCIS FITZGERALD, M.A., 
¥.T,C.D, (October, 1878.) 
