Vin CONTENTS OF VOL. XXV. — THIRD SERIES. 



Page 



Opianic JFAher 48'2 



Oil Metallic Acids, by M. Freray 482 



On a New Chloride and Oxide of Chromium, by M. E. Peligot 484 



Acetate of Iron as a Remedy for Arsenical Preparations 486 



On a New Character of the Salts of Lime and Magnesia .... 486 



Meteorological Observations for October 1844 487 



Table 488 



NUMBER CLXIX.— SUPPLEMENT TO VOL. XXV. 



Sir W. R. Hamilton on Quaternions ; or on a new System of 



Imaginaries in Algebra {continued) 489 



Notice of some New Zealand and Antarctic Minerals 495 



Mr. H. E. Strickland on the Evidence of the former Existence 

 of Struthious Birds distinct from the Dodo in the islands near 



Mauritius 497 



Drs. H. Will and R. Fresenius on the Inorganic Constituents of 



Plants 500 



Mr. A. Kemp on the Purification of the Soluble Salts of Man- 

 ganese from Iron 519 



Abstract of a Letter from Dr. Leeson on the Preparation of 



Fluoride of Iodine 520 



The Rev. M. O'Brien on the Propagation of Waves in a Resisted 

 Fluid ; with a new Explanation of the Dispersion and Ab- 

 sorption of Light, and other Optical Phaenomena (^continued) 521 



Proceedings of the Zoological Society 528 



' Geological Society 539 



Experiments on the Transmission of the Electric Currents. . . . 540 



Transmission of Scientific Journals, &r 540 



On Opiammon 541 



Xanthopenic Acid 542 



Examination of the Seeds of Phytelephas macrocarpa and micro- 



carpa, by M. von Baumhauer 54.3 



On Limone, by Dr. C. Schmidt 545 



New Method of Silvering Glass 546 



Index 547 



Errata. 



Page 18, note X,for p. 18 read p. 151. 



Corrections in the Translation of M. Wartmann's paper will be found 

 at p. 398. 



