CONTENTS. 

 VOL. LTII. 



No. 321.— February 16, 1893. 



Fast- 



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



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

 Experiments performed with the view of establishing the Relation 

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

 vestigation into the Capacity for Heat of Water at Different Tempe- 

 ratures. By E. H. Griffiths, M.A., Assistant Lecturer, Sidney Sussex 

 College, Cambridge 6 



Studies in the Morphology of Spore-producing Members. Preliminary 

 Statement on the Equisetacese and Psilotacese. By F. O. Bower, 

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

 Glasgow , 19 



Further Experiments on the Action of Light on Bacillus anthracis. 

 By H. Marshall Ward, D.Sc, F.R.S., Professor of Botany, Royal 

 Indian Engineering College 23 



List of Presents , , 45 



February 23, 1893. 



On the Mimetic Forms of Certain Butterflies of the Genus Hypolimnas. 

 By Colonel C. Swinhoe, M.A 47 



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

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

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



On Dischidia Rajjiesiana. By Percy Groom, M.A 51 



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

 John H. Cooke, F.G.S. With a Report on the Organic Remains, by 

 Arthur Smith Woodward, F.L.S., F.G.S., F.Z.S. [Title only] 52 



List of Presents , 52 



On a Meteoric Stone found at Makariwa, near Invercargill, New 

 Zealand. By Professor G. H. F. Ulrich, F.G.S., of the University, 

 Dunedin, New Zealand..., .-. 54 



No. 322.— March 2, 1893. 

 List of Candidates 65 



Harmonic Analysis of Hourly Observations of Air Temperature and 

 Pressure at British Observatories. Part I. Temperature. By Lieut. - 

 General R. Strachey, R.E., F.R.S 66 



The Effects of Mechanical Stress on the Electrical Resistance of 

 Metals. By James H. Gray, M.A., B.Sc., and James B. Henderson, 



B.Sc, International Exhibition Scholars, Glasgow University „ 76 



a 2 



