XI 



Notice relative to the form of the Blood-particles of the Ornithorhynchus 

 hystrix. By John Davy, M.D. F.R.S pa^e 232 



Researches on Electro-chemical equivalents, and on a supposed dis- 

 crepancy between some of them and the atomic weight of the same 

 bodies, as deduced from the theory of isomorphism. By Lieut.- 

 Colonel P. Yorke 232 



Second series of Approximate Deductions made from about 50,000 

 observations taken during the years 1836, 183/, and 1838, at the 

 P. Louis Observatory, Mauritius, four times each day ; namely, at 

 8 A.M., at noon, and at 4 and 8 p.m. By J. A. Lloyd', Esq. F.R.S. 232 



On the Solubility of Silica by Steam ; with an account of an experi- 

 ment on the subject, conducted in the East Indies, by Julius Jef- 

 freys, late of the Hon. East India Company's Medical Establishment 233 



Contributions to the Chemical History of Archil and of Litmus. Bv 

 Robert Kane, M.D. M.R.I. A .'.233 



On the Corpuscles of the Blood. By Martin Barry, M.D. F.R.S. ... 234 



Letter from G. G. Anson, Esq. addressed to the President, enclosing 

 a specimen of a deposit with which nine acres of land near Exeter, 

 belonging to Lord Radnor, had been covered after the subsidence of 

 a flood, and which was sent by H.R.H. Prince Albert, F.R.S 238 



Description of the Specimen referred to in the preceding letter. By 

 John Lindley, Ph. D. F.R.S , 238 



An Account of Experiments on the Reflecting Telescope. By the 

 Right Hon. Lord Oxmantown, F.R.S 238 



On the theoretical explanation of an apparently new Polarity in Light. 

 By G. B. Airy, Esq. M.A. F.R.S. Astronomer Royal 239 



On the Ferrosesquicyanuret of Potassium. By Alfred Smee, Esq. ... 239 



On the influence of Iodine in rendering several argentine compounds, 

 spread on paper, sensitive to light ; and on a new Method of pro- 

 ducing, with greater distinctness, the Photogenic Image. By Mr. 

 Robert Hunt 239 



Hourly Obsei^vations of the Barometer and Thermometer at sea, on 

 the 21st of March, 1840. By Major-General A. Lindsay, H.E.I.C.S. 239 



On the Constitution of Pigotite, and on the Mudesous and Mudesic 

 Acids. By James F. W. Johnston Esq. F.R.S 239 



On the Constitution of the Resins. — Part V. By James F. W. 

 Johnston, Esq. M.A. F.R.S 241 



Researches on the Tides. — Twelfth Series. On the Laws of the Rise 

 and Fall of the Sea's surface during each tide. Bv the Rev. W. 

 Whewell, B.D. F.R.S. Fellow of Trinity College, Cambridge 242 



Researches in Embryology. Third Series. — Additional Observations. 

 By Martin Barry,' M.D. F.R.S 243 



Description of a Calculating Machine invented by Mr. Thomas Fow- 

 ler, of Torrington in Devonshire. By Augustus De Morgan, Esq. 243 



On the Minute Structure and Movements of Voluntary Muscles, in a 

 letter addressed to R. B. Todd, M.D. F.R.S. &c. By WilHam 

 Bowman, Esq. Demonstrator of Anatomy in King's College, Lon- 

 don, and Assistant Surgeon to King's College Hospital 244 



Supplement to a paper ' On the Theroetical Explanations of an appa- 



