CONTENTS. 



VOL. LVIL 



No. 340. November 15, 1894. 



Page 



Further Observations on the Organisation of the Fossil Plants of the 

 Coal-Measures. Part 2. The Boots of Calamites. By W. C. 

 Williamson, LL.D.. F.E.S., Emeritus Professor of Botany in the 

 Owens College, Manchester ; and D. H. Scott, M.A., Ph.D., F.E.S., 

 Honorary Keeper of the Jodrell Laboratory, Eoyal Gardens, Kew .... 1 



On the Ascent of Sap. By Henry H. Dixon, B.A., Assistant to the 

 Professor of Botany, Trinity College, Dublin ; and J. Joly, M.A., 

 Sc.D., F.E.S 3 



The Pigments of the Pieridse. A Contribution to the Study of Ex- 

 cretory Substances which function in Ornament. By F. Gowland 

 Hopkins, Demonstrator of Physiology and Chemistry at Guy's 

 Hospital, London ,\ 5 



List of Presents ... 6 



November 22, 1894. 



A Determination of the Specific Heat of Water in terms of the Inter- 

 national Electric Units. By Arthur Schuster, F.RS., Langworthy 

 Professor of Physics at the Owens College, Manchester ; and 

 William Gannon, M.A., Exhibition (1851) Scholar, Queen's College, 

 Galway 25 



On the Temperature of the Carbons of the Electric Arc ; with a Note 

 on the Temperature of the Sun. By W. E. Wilson and P. L. Gray. 

 {Title only.] 32 



Observations of* Sun-spot Spectra, 1879 1894. By J. Norman 

 Lockyer, C.B., F.E.S. {Title only.} 32 



List of Presents .... 2 



November 30, 1894. 

 ANNIVERSARY MEETING. 



Ileport of Auditors 35 



List of Fellows deceased since last Anniversary 3(> 



elected ... 36 



