ix 



Page 



Preliminary Communication on the Structure and Presence in Sphenodon 

 and other Lizards of the Median Eye, described by von Graaf in A nguis 

 fragilis. By W. Baldwin Spencer, B.A., Demonstrator of Comparative 

 Anatomy in University of Oxford, Fellow of Lincoln College 559 



Star Photography. The Effects of Long and Short Exposures on Star 

 Magnitudes. By Isaac Eoberts, F.R.A.S 566 



An Instrument for the Speedy Volumetric Determination of Carbonic 

 Acid. By W. Marcet, M.D., F.R.S. 566 



On the Practical Measurements of Temperatures ; Experiments made at 

 the Cavendish Laboratory, Cambridge. By H. L. Callendar, B.A., 

 Scholar of Trinity College, Cambridge 566 



The Determination of Organic Matter in Air. By Professor T. Carnelley 

 and William Mackie 566 



The Carbonic Acid, Organic Matter, and Micro-organisms in Air, more 

 especially of Dwellings and Schools. By Professor T. Carnelley, J. S. 

 Haldane, and Dr. A. M. Anderson 566 



Preliminary Report on the Pathology of Cholera Asiatica (as observed in 

 Spain, 1885). By C. S. Roy, F.R.S., J. Graham Brown, M.D., &c, 

 and C. S. Sherrington, M.B 566 



Lists of Presents 567 



Index 575 



Obituary Notice : — 



Captain Sir Frederick J. O. Evans, R.N., K.C.B i 



