PROCEEDINGS OF 

 ROYAL SOCIETY. 



vol. Lin. No. 321. 



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content^ 34 1&9. 



PAGE 



February 16, 1893. 



I. On a Portable Ophthalmometer. By Thomas Reid, M.D. ... 1 



II. The Value of the Mechanical Equivalent of Heat, deduced from some 

 Experiments performed with the view of establishing the Eelation 

 between the Electrical and Mechanical Units, together with an Investi- 

 gation into the Capacity for Heat of Water at different Temperatures. 

 By E. H. Geifpiths, M.A., Assistant Lecturer, Sidney Sussex College, 

 Cambridge . .6 



III. Studies in the Morphology of Spore-producing Members. Preliminary 



Statement on the Equisetaceae and Psilotacese. By F. O. Bowee, 

 D.Sc, F.R.S., Regius Professor of Botany in the University of Glasgow 1 



IV. Further Experiments on the Action of Light on Bacillus anthracis. By 



H. Mabshaxl Waed, D.Sc, F.R.S., Professor of Botany, Royal 

 Indian Engineering College 



List of Presents 45 



February 23, 1893. 



I. On the Mimetic Forms of certain Butterflies of the Genus BZypolimnas. 



By Colonel C. Swinhoe, M.A 47 



II. Upon the Action of Gravity on Bacterium Zopfii. By Rtjbebt Boyce, 

 M.B., Assistant Professor of Pathology, University College, London, 

 and A. Ebnest Evans, M.B., CM., Glasgow 48 



III. On Disehidia Rafflesiana. By Peecy Geoom, M.A 51 



IY. The Har Dalam Cavern, Malta, and its Fossiliferous Contents. By John 

 H. Cooee, F.G.S. With a Report on the Organic Remains, by Aethtje 

 Smith Woodwaed, F.L.S., F.G.S., F.Z.S. {Title only'] ... .52 



List of Presents 52 



For continuation of Contents see 2nd page of Wrapper. 



Price Two Shillings and Sixpence. 

 May 11, 1893. 



