[ iv ] 
XVIII. On the Photographic Spectra of Stars. By William Huggins, D.C.L., 
LL.D., F.R.S .. page 669 
XIX. On the Electromagnetic Theory of the Reflection and Refraction of Light. By 
Geo. Feas. Fitzgeeald, M.A., Fellow of Trinity College, Dublin. Communi 
cated by G. J. Stoney, FI.A., F.R.S., Secretary of the Queens University of 
■ Ireland . 691 
XX. On the Secular Changes in the Elements of the Orbit of a Satellite revolving about 
a Tidally Distorted Planet. By G. H. Daewin, F.R.S . 713 
Index to Part II. 
893 
