IV 



Page 



On the Nervous System of Actinia. Part I. By Professor P. Martin 

 Duncan, M.B. Lond., F.R.S., &c 44 



On certain Discrepancies in the published numerical value of TT. By Wil- 

 liam Shanks 45 



On Double Eefraction in a Viscous Fluid in motion. By J. Clerk Maxwell, 

 M.A., F.R.S., Professor of Experimental Physics in the University of 

 Cambridge 40 



List of Presents , , 48 



No. 149. January 8, 1874, 



On the Brom-Iodides. By Dr. Maxwell Simpson, F.R.S., Professor of Che- 

 mistry, Queen's College, Cork 51 



Contributions to the History of the Orcins. No. IV. On the lodo-deriva- 

 tives of the Orcins. By John Stenhouse, LL.D., F.E.S., &c 53 



A Memoir on the Transformation of Elliptic Functions. By Professor 

 Cayley, F.R.S 56 



On Electrotorsion. By George Gore, F.R.S 57 



January 15, 1874. 



Preliminary Account of an Investigation on the Transmission of Sound by 

 the Atmosphere. By John Tyndall, D.C.L., LL.D., F.R.S 58 



January 22, 1874. 



On the Nature and Physiological Action of the Poison of Naja tiipudians 

 and other Indian Venomous Snakes. Part II. By T. Lander Brunton, 

 M.D., Sc.D., M.R.C.P., and J. Fayrer, C.S.I., M.D., F.R.C.P. Lond., 

 F.R.S.E., Surgeon-Major Bengal Army C8 



January 29, 1874. 



Contributions to the Normal and Pathological Anatomy of the Lymphatic 

 System of the Lungs. By E. Klein, M.D., Assistant Professor at the 

 Laboratory of the Brown Institution, London 133 



On the Comparative Value of certain Geological Ages (or groups of forma- 

 tions) considered as items of Geological Time. By A. C. Ramsay, LL.D., 

 V.P.R.S , . , .145 



List of Presents , , 148 



No. 150. February 5, 1874. 



On the Anatomy and Habits of the genus Phronima (Latr.) . By John Denis 

 Macdonald, M.D., F.R.S., Staff Surgeon R.N., Assistant Professor of 

 Nayal Hygiene, Netley Medical School, (Plate I.) 154 



