IV 



Page 



On Clairautian Functions and Equations. By Capt. Allan Cunningham, 



B.E., Hon. FelloTv of Kings Coll. Lond. (Roorkee, India) 43 



May 18, 187C. 



Absorption-Spectra of Iodine. By Sir John Conroy, Bart., M.A 



On the Polarization of Light by Crystals of Iodine. By Sir John Conroy, 

 Bart., M.A f .\ 51 



Picrorocellin. By John Stenhouse, LL.D., F.R.S., and Charles Edward 

 Groyes ' 60 



On the Organization of the Fossil Plants of the Coal-measm-es. — Part VIII. 

 Ferns (continued) and Gymnospermous Stems and Seeds. By Prof. W. 

 C. Williamson, F.R.S,, Professor of Natural History, Owens College, 

 Manchester 68 



On Stratified Discharges. — II. Obseryations with a Reyolying Mirror. By 

 William Spottiswoode, M.A., Treas. R.S 73 



The Calculus of Chemical Operations. — Part II. On the Analysis of Chemical 

 Eyents. By Sir B. C. Brodie, Bart., F.R.S., late Professor of Chemistry 

 in the Uniyersity of Oxford 83 



List of Presents 8G 



No. 172.— May 18, 1876 (continued). 



Note on a Simultaneous Disturbance of the Barometer and of the Magnetic 

 Needle. By the Rey. S. J. Perry, F.R.S 90 



June 1, 1876. 



Election of Fellows 92 



Jime 15, 1876. 



Report to the Ilydrographer of the Admiralty on the Voyage of the 

 ' Challenger ' from the Falkland Islands to Monte Video, and a Position 

 in lat. 32° 24' S., long. 13° 5' W. By Prof. WyyHle Thomson, F.R.S., 

 Director of the Ciyilian Scientific Staff on Board 92 



Preliminary Note on the Structure of the Stylasteridae, a group of Stony 

 Corals which, like the Milleporicl£e, are Hydroids, and not Anthozoans. 

 By H. N. Moseley, Naturalist on board H.M.S. ' Challenger ' 93 



On the Comparatiye Anatomy of the Auditory Ossicles of the Mammalia. 

 By Alban H. G. Doran, F.R.C.S 101 



On two new Vanadium Minerals. By H. E. Roscoe, F.R.S 109 



The Action of Light on Selenium. By Professor W. G. Adams, F.R.S., and 

 Mr. R.E.Day 113 



