V 



February 17. 1887. 



Page 



A Record of Experiments upon the Functions of the Cerebral Cortex. 

 By Victor Horsley, M.B., F.R.C.S., F.R.S., Professor Superintendent 

 of the Brown Institution, and Edward Albert Sehafer, F.R.S., Jodrell 

 Professor of Physiology in University College, London. (From the 

 Physiological Laboratory of University College) Ill 



On Radiant Matter Spectroscopy : — Examination of the Residual Glow. 

 By William Crookes, F.R.S., V.P.C.S Ill 



List of Presents 131 



February 24, 1887. 



Problems in Mechanism regarding Trains of Pulleys and Drums of Least 

 Weight for a given Velocity Ratio. By Henry Hennessy, F.R.S., 

 Professor of Applied Mathematics and Mechanism in the Royal College 

 of Science, Dublin 134 



On the Relation between Tropical and Extra-tropical Cyclones. By Hon. 

 Ralph Abercromby, F.R. Met. Soc 138 



A Thermal Telephone Transmitter. By Professor George Forbes 141 



List of Presents 142 



No. 253.— March 3, 1887. 

 List of Candidates 145 



Preliminary Note on a Balanoglossus Larva from the Bahamas. By W. 

 F. R. Weldon, M.A., Fellow of St. John's College, Cambridge 146 



Studies of some New Micro-organisms obtained from Air. By G. C. 

 Frankland, and Percy F. Frankland, Ph.D., B.Sc. (Lond.), F.C.S., 

 F.I.C 150 



On the Limiting Distance of Speech by Telephone. By William Henry 

 Preece, F.R.S 152 



The Etiology of Scarlet Fever. By E. Klein, M.D., F.R.S., Lecturer on 

 General Anatomy and Physiology at the Medical School of St. 

 Bartholomew's Hospital, London 158 



List of Presents 161 



March 10, 1887. 



Note on Induction Coils or "Transformers." Bv John Hopkinson, M.A., 

 D.Sc, F.RS v 164 



Note on the Theory of the Alternate Current Dynamo. By John 

 Hopkinson, M. A., D.Sc, F.R.S 167 



Transmission of Sunlight through the Earth's Atmosphere. By Captain 

 W. de W. Abney, R.E., F.R.S 170 



List of Presents 172 



