IV 



January 20, 1887. 



Page 



Some Anomalies in the Winds of Northern India, and their Eelation to 

 the Distribution of Barometric Pressure. By S. A. Hill, B.Sc., 

 Meteorological Beporter to Government, North- Western Provinces and 

 Oudh m 35 



Evaporation and Dissociation. Part Y. A Study of the Thermal Pro- 

 perties of Methyl Alcohol. By William Ramsay, Ph.D., and Sydney 

 Young, D.Sc. 37 



Further Discussion of the Sun-Spot Observations made at South Kensing- 

 ton. By J. Norman Lockyer, F.R.S 37 



List of Presents 47 



January 27, 1887. 



On a Perspective Microscope. By George J. Burch 49 



On the Thermodynamic Properties of Substances whose Intrinsic Equation 

 is a Linear Function of the Pressure and Temperature. By Geo. Fras. 

 Fitzgerald, M.A., F.B.S .- 50 



\ On the Morphology of Birds. By W. K. Parker, F.R.S 52 



List of Presents 59 



On the Computation of the Harmonic Components of a Series representing 

 a Phenomenon recurring in Daily and Yearly Periods. By Lieut. - 

 General R. Strachey, R.E., F.RS 61 



No. ^.—February 3, 1887. 



On the Waves produced by a Single Impulse in Water of any Depth, or 

 in a Dispersive Medium. By Sir W. Thomson, Knt., LL.D., F.RS 80 



On the Formation of Coreless Yortices by the Motion of a Solid through 

 an inviscid incompressible Fluid. By Sir W. Thomson, Knt., LL.D., 

 F.R.S 83 



On Protorosaurus Speneri (von Meyer). By H. G. Seeley, F.R.S., Pro- 

 fessor of Geography in King's College, London 86 



List of Presents 86 



February 10, 1887. 



Contributions to the Metallurgy of Bismuth. Bv Edward Matthey, 

 F.S.A., F.C.S., Assoc. Roy. Sch. Mines 89 



An Inquiry into the Cause and Extent of a special Colour-Relation 

 between certain exposed Lepidopterous Pupse and the Surfaces which 

 immediately surround them. By Edward B. Poulton, M.A., of Jesus 

 and Keble Colleges, Oxford, Lecturer in Zoology and Comparative 

 Anatomy at St. Mary's Hospital, Paddington 94 



List of Presents 



109 



