[ i'' J 
Deviation. By Akchibald Smith, Esq., M.A., F.B.S., late Fellow of Tnnity Col- 
lege, Cambridge; a7id Feedekick John Evans, Fsq., R.N., Superintendent of the 
Compass Department of Her Majesty's Navy page 161 
X. lAquid Diffusion applied to Analysis. By Thomas Geaham, F.B.S., Master of the 
Mint 183 
XI. On the Porism of the in-aoid-circumscribed Poly gem. By Aethue Cayley, Esq., 
F . R . S . 225 
XII. Tables of the Weights of the Human Body and Internal Organs in the Sane and 
Insane of both Sexes at various Ages, arranged from 201^ post-mortem examina- 
tio?is. By Robeet Boyd, M.D., F.B.C.P.L., Physician to the Somerset County 
Lunatic Asylum. Communicated by Dr. Shaepey, Sec. B.S 241 
XIII. On a New Auxiliary Equation in the Theory of Equations of the Fifth Order. 
By Aethue Cayley, Esq., F.R.S 263 
XIV. A Seventh Memoir on Quantics. By Aethue Cayley, Esq., F.R.S. . . . 277 
X'C. On Systems of Linear Indeterminate Equations and Congruences. By Heney J. 
Stephen Smith, M.A., Fellow and Mathematical Lecturer of Balliol College, 
Oxfot'd. Co7nmunicated by J. J. Sylvestee, Esq., F.R.S 293 
XVI. On the Method of Symmetric Products, and on Certain Circular Functions con- 
nected with that Method. By the Rev. Robeet Haeley, F.R.A.S., Corresponding 
Member of the Literary and Philosophical Society of Manchester. Communicated 
by A. Cayley, Esq., F.R.S 327 
XVII. On the Double Tanqents of a Curve of the Fourth Order . By Aethue Cayley, 
Esq ., F . R.S 357 
XVIII. Electro-Physiological Researches . — Eleventh Series. On the Secondar'y Electro- 
motor Power of Nerves, and its Application to the Explanation of certain Electro- 
Physiological Phenomena. By Signor Caelo Matteucci. Communicated by 
General Sabine, Treas. and V.P.R.S. 363 
XIX. On Liquid Transpiration in relation to Chemical Composition. By Thomas Geaham, 
F.R.S., Master of the Mint 373 
XX. On the Structure and Growth of the Tooth of Echinus, By S. James A. Saltee, 
M.B. Bond., F.L.S., F.G.S. Communicated by Thomas Bell, Esq., F.R.S. 387 
XXI. On Feemat’s Theorem of the Polygonal Numbers . — Part I. By Sir Feedeeick 
Pollock, F.R.S., Lord Chief Baron, &c. &c 409 
XXII. Oil the Great Magnetic Disturbance which extended from August 28 September 7 , 
1859, as recorded by Photography cut the Kew Observatory. By Balfoue Stewaet, 
AM. 423 
