On the Condition of the Oxygen absorbed into the Blood during 

 Respiration. By George Harley, M.D page 78 



Description of the Observatory of the Collegio Romano at Rome. By 

 P. L Secchi ........ V 83 



Elements of a Mathematical Theory of Elasticity. By Prof. Wil- 

 liam Thomson, F.R.S 85 



On the Construction of the Imperial Standard Pound, and its Copies 

 of Platinum; and on the comparison of the Imperial Standard 

 Pound with the Kilogramme des Archives. By W. H. Miller, M.A., 

 F.R.S., Professor of Mineralogy in the University of Cambridge. 

 Part 1 87 



On various Phenomena of Refraction through Semi-lenses or Prisms, 

 producing anomalies in the illusion of Stereoscopic Images. By 

 A. Claudet, Esq., F.R.S '.104 



A Memoir upon Caustics. By Arthur Cayley, Esq., F.R.S. . . .110 



On the Figure, Dimensions, and Mean Specific Gravity of the Earth, 

 as derived from the Ordnance Trigonometrical Survey of Great 

 Britain and Ireland. Communicated by Lieut.-Colonel James, 

 R.E., F.R.S. &c., Superintendent of the Ordnance Survey . . .111 



On the Application of Photography to the physiognomic and mental 

 phenomena of Insanity. By Hugh W. Diamond, M.D 117 



On the Problem of Three Bodies. By the Rev. J. Challis, M.A., 

 F.R.S., F.R.A.S 117 



On some of the Products of the Distillation of Boghead Coal at low 

 temperatures. By G. Greville Williams, Esq 119 



On Peristaltic Induction of Electric Currents. By Professor William 

 Thomson, F.R.S 121 



Experimental Researches on the Functions of the Mucous Membrane 

 of the Gall-bladder, principally with reference to the Conversion 

 of Hepatic into Cystic Bile. By George Kemp, M.D 133 



Special General Meeting 141 



Annual General Meeting for the Election of Fellows 143 



On the Construction of the Imperial Standard Pound, and its Copies 

 of Platinum ; and on the comparison of the Imperial Standard 

 Pound with the Kilogramme des Archives. By W. H. Miller, M. A., 

 F.R.S., Professor of Mineralogy in the University of Cambridge. 

 PartH 144 



On the Determination of Unknown Functions which are involved 

 under Definite Integrals. By J. Gomes de Souza, Professor of 

 Mathematics in the Military Academy of Rio Janeiro 146 



On the Detection of Strychnia by the formation of lodo-strychnia. 

 By Dr. W. Bird Herapath ". . . 149 



Dynamical Illustrations of the Magnetic and the Helicoidal Rotatorv 

 Effects of Transparent Bodies on Polarized Light. By Prof. W. 

 Thomson, F.R.S. .150 



