536 Presents. [May 14, 



transverse waves have been considered. The absolute velocity in a 

 vacuum must take account of the fact that the ratio of the electro* 

 static and electromagnetic units of quantity has been altered by the 

 factor K' 2 * in the transition to Maxwell's theory, where K', now 

 represents the assumed absolute inductive capacity of the vacuum : 

 thus the velocity for vacuum is (l K'r l )~* multiplied by the ratio 

 of the electric units in vacuum, agreeing with von Helmholtz's result,* 

 on writing this inductive capacity K' 2 for his constant 1+4 **<>, and 

 exceeding the velocity of light unless K' is very great. 



The theory of electrodynamics would thus appear to be, on all sides, 

 limited to Maxwell's scheme, which has also so much to recommend 

 it on the score of intrinsic simplicity. 



The Society adjourned over the Whitsuntide Recess to Thursday, 

 Mav 28. 



Presents, May 14, 1891. 

 Transactions. 



Cracow : Academic des Sciences. Bulletin International. Comptes 



Bendns des Seances. 1891. No. 3. 8vo. Cracovie. 



The Academy. 

 Paris : Bibliotheque du Depot de la Guerre. Catalogue. Tome 



VII. 8vo. Part? 1890. Ministere de la Guerre, Paris. 



Rome : Reale Accademia dei Lincei. Atti. Serie 4. (Classe di 



Scienze Morali, Storiche e Filologiche). Memorie. Vols. 



II-V. 4to. Roma 1886-88. The Academy. 



Salford : Museum, Libraries, and Parks Committee. Annual 



Report, 1889-00. 8vo. Salford. The Committee. 



Stockholm : Kongl. Vetenskaps-Akademie. Ofversigt. Arg. 48. 



No. 1. 8vo. Stockholm 1891. The Academy. 



Tokio : Universitat. Mitteilungen aus der Medicinischen Facultat. 



Bd. I. No. 4 4to. Tokyo 1890. The University. 



Toulouse : Facnlte des Sciences. Annales. Tome IV. Fasc. 2. 



4to. Paris 1890. The Faculty. 



Turin: R. Accademia delle Scienze. Atti. Vol. XXVI. Disp. 



1-3. 8vo. Torino 1890-91 ; Osservazioni Meteorologiche. 



1890. 8vo. Torino 1891. The Academy. 



Utrecht: Provinciaal Utrechtsch Genootschap van Kunsten en 



Wetenschappen. Aanteekeningen van het verhandelde in de 



Sectie Vergaderingen. 1890. 8vo. Utrecht. 



The Society. 

 Vienna : Anthropologische Gesellschaft. Mittheilnngen. Bd. 



XXI. Heft 1. 4to. Wien 1891. The Society. 



* Loc. tit., p. 627. 



