vii 



Page 



On some Heterogenetic Modes of Origin of Flagellated Monads, Fungus- 

 germs, and Ciliated Infusoria. By H. Charlton Bastian, M.D., F.R.S., 

 F.L.S., Professor of Pathological Anatomy in University College, London. 239 



List of Presents 264 



On the Elimination of Alcohol. By A. Dupre, Ph.D., Lecturer on Chemistry 

 at Westminster Hospital 268 



No. 134.— April 11, 1872. 



Contributions to the History of the Opium Alkaloids.— Part V. By O.E. 

 A. Wright, D.Sc., Lecturer on Chemistry in St. Maiy's Hospital Medical 

 School 278 



Researches on Solar Physics. — HI. By Warren De La Rue, D.C.L., F.R.S., 

 Balfour Stewart, LL.D., F.R.S., and Benjamin Loewy, F.R.A.S 289 



Corrective Note by Messrs. De La Rue, Stewart, and Loewy to their Paper 

 " On some recent Researches in Solar Physics &c." 290 



The Action of Oxvgen on Copper Nitrate in a state of Tension. By J. H. 

 Gladstone, Ph.D., F.R.S., and Alfred Tribe, F.C.S 290 



April 18, 1872. 



On the Connexion between Explosions in Collieries and Weather. By 

 Robert H. Scott, M.A., F.R.S., and William Galloway, Esq., Mining 

 Engineer 292 



On the Fossil Mammals of Australia. — Part VII. Genus Phascohmys-, 

 species exceeding the existing ones in size. By Prof. R. Owen, F.R.S. . 306 



April 25, 1872, 



Contributions to Formal Logic. By Alexander J. Ellis, F.R.S. , F.C.P.S., 

 F.S.A., &c 307 



On a supposed Periodicity in the elements of Terrestrial Magnetism, with 

 a period of 26§ days. By George Biddell Airy, Astronomer Royal, C.B., 

 P.R.S 308 



List of Presents 313 



No. 135.— May 2, 1872. 



On a new Great Theodolite to be used on the Great Trigonometrical Survey 

 of India, with a short Note on the performance of a Zenith-Sector em- 

 ployed on the same work. By Lieut. -Colonel A. Strange, F.R.S., In- 

 spector of Scientific Instruments, India Department 317 



On some Elementary Principles in Animal Mechanics. — No. V. On the 

 most perfect form of a Plane Quadrilateral Muscle connecting two Bones. 

 By the Rev. Samuel Haughton, F.R.S., M.D. Dubl., D.C.L. Oxon., FeUow 

 of Trinity College, Dublin 328 



On some Elementary Principles in Animal Mechanics. — No. VI. Theory of 

 Skew Muscles, and investigation of the conditions necessary for Maximum 

 W T ork. By the Rev. Samuel Haughton, F.R.S., M.D. Dubl., D.C.L. 

 Oxon., Fellow of Trinity College, Dublin 330 



On the Rings produced by Crystals when submitted to Circularly Polarized 

 Light. By William Spottiswoode, M.A., Treas. & V.P.R.S 333 



