Vll 



March 27, 1890. 



Page 



On Black Soap Films. By A. W. Eeinold, M.A., F.R.S., and A. W. 

 Riicker, M.A., F.R.S 303 



The Variability of the Temperature of the British Isles, 1869—1883, 



inclusive. * By Robert H. Scott, F.R.S. (Plate 9) 303 



The Rupture of Steel by Longitudinal Stress. By Chas. A. Carus- 

 Wilson 363 



Measurements of the Amount of Oil necessary in order to check the 

 Motions of Camphor upon Water. By Lord Rayleigh, Sec. R.S 364 



On the Stability of a Rotating Spheroid of Perfect Liquid. By G. H. 

 Bryan 367 



A Determination of " v," the Ratio of the Electromagnetic Unit of 

 Electricity to the Electrostatic Unit. By J. J. Thomson, M.A., F.R.S., 

 Cavendish Professor of Experimental Physics, Cambridge, and G. F. C. 

 Searle, B.A., Peterhouse, Demonstrator in the Cavendish Laboratory, 

 Cambridge , 376 



On the progressive Paralysis of the different Classes of Nerve Cells in 

 the Superior Cervical Ganglion. By J. N. Langley, F.R.S., Fellow 

 and Lecturer of Trinity College, and W. Lee Dickinson, M.R.C.P., 

 Caius College, Cambridge 379 



List of Presents 390 



No. 290. 



Croontan Lecture. — On some Relations between Host and Parasite in 

 certain Epidemic Diseases of Plants. By H. Marshall Ward, F.R.S., 

 Professor of Botany, Royal Indian Engineering College, Cooper's 

 Hill 393 



No. 291.— April 17, 1890. 



Preliminary Note on Supplementary Magnetic Surveys of Special Dis- 

 tricts in the British Isles. By A. W. Riicker, M.A., F.R.S', and T. E 

 Thorpe, Ph.D., B.Sc. (Vict.), F.R.S 443 



The Variations occurring in certain Decapod Crustacea : — 1. Orangon 

 vulgaris. By W. F. R. Weldon, M.A., Fellow of St. John's College, 



■ Cambridge, and Lecturer on Invertebrate Morphology in the Uni- 

 versity , 445 



Observations on the Anatomy and Development of Apteryx. By T. 

 Jeffery Parker, B.Sc, F.R.S., Professor of Biology in the University of 

 Otago, Dunedin, New Zealand 454 



Notes on some peculiar Relations which appear in the Great Pyramid 

 from the precise measurements of Mr. Flinders Petrie. By Capt. 

 Downing, R.A 459 



List of Presents. 



459 



