[ V ] 
XVII. The Bakerian Lecture.— On the Photographic Method of Mapping the leap 
Refrangible End of the Solar Spectrum. By Captain W. de W. Abney, 
R.E., F.R.S .page 653 
XVIII. On the Photographic Spectra of Stars. By William Huggins, D.C.L., 
LL.D., F.R.S .669 
XIX. On the Electromagnetic Theory of the Reflection and Refraction of Light. By 
Geo. Fras. Fitzgerald, M.A., Fellow of Trinity College, Dublin. Communi¬ 
cated by G. J. Stoney, M.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. Darwin, F.R.S .713 
Index to Part II. ...893 
PART III. 
XXI. A Memoir on the Single and Double Theta-Functions. By A. Cayley, F.R.S., 
Sadlerian Professor of Pure Mathematics in the University of Cam¬ 
bridge . 897 
XXII. Revision of the Atomic Weight of Aluminium. By J. W. Mallet, F.R.S., 
Professor of Chemistry in the University of Virginia .1003 
XXIII. Description of some Remains of the Gigantic Land-Lizard (Megalama prisca, 
Owen), from Australia. — Part II. By Professor Owen, C.B., F.R.S., &c. 1037 
XXIV. On the Ova of the Echidna Hystrix. By Professor Owen, C.B., 
F.R.S., &c .1051 
XXV. On the Determination of the Constants of the Cup Anemometer by Experiments 
with a Whirling Machine — Part II. By T. R. Robinson, D.D., F.R.S, &c. 1055 
XXVI. On the Dynamo-electric Current, and on Certain Means to Improve its Steadi¬ 
ness. By C. William Siemens, D.C.L., F.R.S. .1071 
Index to Volume .1089 
