IV 



On the relation of the Angular Aperture of the Object-Glasses of 

 Compound Microscopes to their penetrating power and to Oblique 

 Light. By J. W. Griffith, M.D., F.L.S page 60 



On some conclusions derived from the Observations of the Magnetic 

 Declination at the Observatory of St. Helena. By Colonel Edward 

 Sabine, R.A., V.P.R.S 67 



Election of Fellows 82 



The Bakerian Lecture. On Osmotic Force. By Professor Graham, 

 V.P.R.S 83 



Examination of the Cerebro-spinal Fluid. By William Turner, Esq. 89 



On the Oxidation of Ammonia in the Human Body. By H. Bence 

 Jones, M.D., F.R.S 94 



On the Disintegration of Urinary Calculi by the Lateral Disruptive 

 Force of the Electrical Discharge. By George Robinson, M.D. ... 99 



The Attraction of Ellipsoids considered generally. By Matthew Col- 

 lins, Esq., B.A 103 



Researches on the Impregnation of the Ovum in the Amphibia. (Third 

 Series.) From the MS. papers of the late George Newport, Esq., 

 F.R.S 104 



Contributions to the Anatomy of the Brachiopoda. By Thomas H. 

 Huxley, Esq., F.R.S 106 



On the production of Pictures on the Retina of the Human Eye. 

 Part II. By the Rev William Scoresby, D.D., F.R.S 117 



On the frequent occurrence of Indigo in Human Urine, and on its 

 Chemical, Physiological and Pathological Relations. By Arthur 

 Hill Hassall, M.D 122 



On the Effect of the Pressure of the Atmosphere on the Mean Level 

 of the Ocean. By Captain Sir James Clark Ross, R.N., F.R.S. ... 123 



On the Thermal Effects of Fluids in Motion. No. II. By J. P. 

 Joule, Esq., F.R.S., and Professor W. Thomson, F.R.S 127 



Note on Nitro-glycerine. By A. W. Williamson, Ph.D., F.C.S. ... 130 

 On a New Phosphite of Ethyl. By A. W. Williamson, Ph.D., F.C.S. 131 



On some new derivatives of Chloroform. By A. W. Williamson, 

 Ph.D., F.C.S 135 



On the Structure of certain Microscopic Test-objects, and their Action 

 on the Transmitted Rays of Light. By Chas. Brooke, M.A., F.R.S. 139 



On the Constitution of Coal-tar Creosote. By Professor William- 

 son, Ph.D., F.C.S 143 



On the Formation of Powers from Arithmetical Progressions. By 

 C. Wheatstone, Esq., F.R.S 145 



On the Structure and Functions of the Rostellum in Listera ovata. 

 By J. D. Hooker, M.D., F.R.S: 152 



On the Immediate Principles of the Excrements of Man and Animals 

 in the Healthy Condition. By William Marcet, M.D 153 



On the Vine-Disease in the Port- wine Districts of the Alto-Douro, in 

 April 1854. With a Supplementary Note on the proposed Reme- 

 dies for its Eradication. By Jos. James Forrester, Esq., F.R.G.S. 155 



