[ V ] 
XXII. New Researches upon the Dispersion of the Optic Axes in Harmotome and 
Wohler it e, proving these Minerals to belong to the Clinorhombic [ Oblique ] System. 
By A. L. O. Des Cloizeaux. Communicated by Professor W. H. Miller, For. 
Sec. R.S. page 565 
XXIII. On the Conditions for the existence of Three Equal Roots, or of Two Pairs of 
Equal Roots, of a Binary Quartic or Quintic. By Professor A. Cayley, 
F.R.S. 577 
XXIV. Researches on the Blood. — On the Action of Nitrites on Blood. By Arthur 
Gamgee, M.D., F.R.S. E., Assistant to the Professor of Medical Jurisprudence 
in the University of Edinburgh. Communicated by Professor Frankland, 
F.R.S. 5S9 
XXV. On the Mysteries of Numbers alluded to by Fermat. — S econd Communication. 
By the Right Hon. Sir Frederick Pollock, Bart., M.A., F.R.S., F.S.A., 
F.G.S., &c 627 
XXVI. On a Method of making a Direct Comparison of Electrostatic with Electro- 
magnetic Force; with a Note on the Electromagnetic Theory of Light. By 
J. Clerk Maxwell, F.R.SS. L. & E. 643 
XXVII. On Supersaturated Saline Solutions. By Charles Tomlinson, F.R.S. . 659 
XXVIII. The Caudal Heart of the Eel a Lymphatic Heart. — Effect of the force with 
which the lymph-stream is propelled therefrom on the flow of the blood in the 
Vein into which the heart opens. — Explanation of the appearance of blood pro- 
pelled in successive drops, as if from the heart, along the Caudal Vein. — Influence 
which the force of the lymph-stream from the heart exerts in accelerating and 
promoting the flow of blood in the Caudal Vein. By Thomas Wharton Jones, 
F.R.S., Professor of Ophthalmic Medicine and Surgery in University College, 
London, Ophthalmic Surgeon to the University College Hospital, &c. . . 675 
XXIX. On the Tides of Bombay and Kurrachee. % William Parkes, M.Inst. C.E. 
Communicated by G. B. Airy, Astronomer Royal, F.R.S. ...... 685 
Index 697 
Appendix. 
Presents ..... ... .,...[ 1 ] 
ERRATUM. 
The — prefix has been accidentally omitted in the Yalnes of the Magnetic Intensities in pages 407 and 408. 
