On the Optical and Physical Properties of Tabasheer. By David 

 Brewster, LL.D. F.R.S. L.&E page 115 



An Account of a Membrane in the Eye, now first described. By 

 Arthur Jacob, M.D 116 



A New Method of Solving Numerical Equations of all Orders, by con- 

 tinuous Approximation. By W. G. Homer, Esq 117 



An Account of Experiments for determining the Variation in the 

 Length of the Pendulum Vibrating Seconds, at the principal Sta- 

 tions of the Trigonometrical Survey of Great Britain. By Captain 

 Henry Kater, F.R.S 117 



1820. 



The Croonian Lecture. A further Investigation of the Component 

 Parts of the Blood. By Sir Everard Home, Bart. V.P.R.S. ... page 118 



The Bakerian Lecture. On the Composition and Analysis of the In- 

 flammable Gaseous Compounds resulting from the Destructive Di- 

 stillation of Coal and Oil, with some Remarks on their relative 

 Heating and Illuminating Powers. By William Thomas Brande, 

 Esq. Sec.R.S 119 



On the Elasticity of the Lungs. By James Carson, M.D 121 



On the Action of Crystallized Bodies on Homogeneous Light, and on 

 the Causes of the Deviation from Newton's Scale in the Tints 

 which many of them develope on Exposure to a Polarized Ray. 

 By J. F. W. Herschel, Esq. F.R.S. L. & E 122 



A Case of the Human Fcetus found in the Ovarium, of the Size it 

 usually acquires at the End of the Fourth Month. By A. B. Gran- 

 ville, M.D. F.R.S 123 



On some Combinations of Platinum. By Edmund Davy, Esq 124 



On the Methods of Cutting Rock Crystal for Micrometers. By Wil- 

 liam Hyde Wollaston, M.D. F.R.S 124 



On a New Principle of constructing Ships in the Mercantile Navy. 

 By Sir Robert Seppings, F.R.S 125 



On the Milk Tusks, and Organ of Hearing of the Dugong. By Sir 

 Everard Home, Bart. V.P.R.S 126 



Upon the different Qualities of the Alburnum of Spring and Winter- 

 felled Oak Trees. By Thomas Andrew Kight, Esq. F.R.S 127 



On the Mode of Formation of the Canal for containing the Spinal 

 Marrow, and on the Form of the Fins (if they deserve that name) 

 of the Proteo-Saurus. By Sir Everard Home, Bart. V.P.R.S. ... 128 



Some Experiments on the Fungi which constitute the Colouring Mat- 

 ter of the Red Snow discovered in Baffin's Bay. By Francis Bauer, 

 Esq. F.L.S 128 



Some Account of the Dugong. By Sir Thomas Stamford Raffles ... 129 



Observations on the Human Urethra, showing its internal Structure, 

 as it appeared in the Microscope of F. Bauer, Esq. By Sir Everard 

 Home, Bart. V.P.R.S 130 



On the Errors in Longitude as determined by Chronometers at Sea, 

 arising from the Action of the Iron in the Ships upon the Chro- 

 nometers. By George Fisher, Esq 130 



