[ V ] 
XVII. Memoir on Abel’s Theorem. By R. C. Rowe, M.A., Fellow of Trinity College, 
Cambridge. Communicated by A. Cayley, LL.D., F.R.S., Sadlerian Professor 
of Mathematics in the University of Cambridge .page 713 
Addition to Mr. Rowe’s Memoir. By Professor Cayley, F.R.S. . . . 751 
XVIII. On Riccati’s Equation and its Transformations , and on some Definite Integrals 
irhich satisfy them. By J. W. L. Glaisher, M.A., F.R.S., Felloiv of Trinity 
College, Cambridge .759 
XIX. The Croonian Lecture. — Observations on the Locomotor System of Echinoder- 
mata. By George J. Romanes, M.A., F.R.S., and Professor J, Cossar 
Ewart, M.D . 829 
XX. On the Influence of the Molecular Grouping in Organic Bodies on their Absorp¬ 
tion in the Infra-red Region of the Spectrum. By Captain Abney, R.E., F.R.S., 
and Lieut.-Colonel Festing, R.E. . . . 887 
Index to Volume . 919 
