CONTENTS. 



MEMOIRS. 



I. Notes on a Collection of Hepatics from the Cameroons. West 

 Coast of Africa. By William H. Pearson, M.Sc., A.L.S. 

 With 2 Plates ... ... ... ... ... ... ... pp. i — 6 



(Issued separately, March 31st, 1Q21.) 



II. The Polytropic Curve and Its Relation to Thermodynamic 

 Efficiency. (With Note on the Uniflow Engine.) By W. J. 

 Walker, Ph.D., B.Sc, A.M.Inst.C.E. With 7 Text-figs. pp. 1— 11 

 (Issued separately, June 28th, 1Q21.) 



III. The Work and Discoveries of Joule. By Sir Dugald Clerk, 



K.B.E., D.Sc, LL.D., F.R.S pp. 1—20 



The first Joule Memorial Lecture, delivered December 14th, ig2o. 

 (Issued separately, May 12th, 1Q21.) 



IV. Studies in Capillarity. I. Some General Considerations and a 



Discussion of Methods for the Measurement of Interfacial 

 Tensions. By Allan Ferguson, M.A., D.Sc. With 1 



Text-fig. ... ... ... ... ... ... pp. 1 — 16 



Joint Meeting with the Faraday Society. 

 (Issued separately, May 17th, 1Q21.) 



V. Studies in Capillarity. II. On a Modification of the Capillary 

 Tube Method for the Measurement of Surface Tensions. By 

 Allan Ferguson, M.A., D.Sc, and P. E. Dowson, M.A, With 

 1 Text- fig. ... ... ... ... ... ... ... pp 1 — 8 



Joint Meeting with the Faraday Society. 

 (Issued separately, May 17th, 1Q21.) 



VI. Some Chapters from the History of English Spelling and the 

 Need of a New Chapter. By Professor Miles Walker, M.A., 

 D.Sc. ... ... ... ... ... ... ... pp. 1 — 16 



(Issued separately, June 24th, 1Q21.) 



VII. Manx Mines and Megaliths. By W. H. Corkill. With 2 



Maps pp. 1—8 



(Issued separately, June 30th, 1Q21.) 



VIII. Variation of Sphaeria. I. Sphcerium lacustre (Miiller). By W. E. 



Alkins, M.Sc. With 7 Tables ... pp. 1 — 10 



(Issued separately, September 30th, ig2i.) 



