1874.] Presents. 473 



possible number of stations. Germany and France may give sufficient 

 data for such a trial. Were the result well marked, there would be 

 reason to seek for its confirmation in other countries ; but to undertake 

 this labour, better grounds, I think, must be found than I have hitherto 

 been able to obtain. The admirable series of observations which Mr. 

 Symons is obtaining will suffice for the future, as for the past, ten years 

 to give a very near approximation to the excess or deficiency of rainfall 

 in Great Britain. 



XXIV. " On the Mechanism of Stromboli." By ROBERT MALLET, 

 M.A., F.R.S. Received May 17, 1874*. 



The Society then adjourned over the Long Vacation, to Thursday, 

 November 19. 



Presents received May 21, 1874. 

 Transactions. 



Berlin : Physikalische Gesellschaft. Die Fortschritte der Physik im 



Jahre 1869, redigirt von Dr. B. Schwalbe. Jahrgang 25. 8vo. 



Berlin 1873. The Society. 



Birmingham : Institution of Mechanical Engineers. Proceedings, 



October 30, 1873. 8vo. The Institution. 



London : Pharmaceutical Society. Pharmaceutical Journal and 



Transactions. February to May 1874. 8vo. Calendar. 8vo. 1874. 



Catalogue of the Library. 8vo. 1874. The Society. 



Royal United Service Institution. Journal. Vol. XVII. No. 74, 



75, and Appendix. 8vo. 1873-74. Lectures addressed to Officers 



of Volunteer Corps. 8vo. 1873. The Institution. 



Manchester : Geological Society. Transactions. Vol. XIII. Part 3. 



8vo. 1874. The Society. 



Montreal : Natural History Society. The Canadian Naturalist and 



Quarterly Journal of Science. Vol. VII. No. 2-4. 8vo, 1873-74. 



The Society. 

 Toronto : Canadian Institute. Canadian Journal. Vol. XIV. No. 1, 2. 



8vo. 1873-74. The Institute. 



Reports &c. 



Basel : Zoologischer Garten. Erster Geschaftsbericht des Ver- 

 waltungsrathes. 4to. 1874. Herr A. Miiller. 



* This Paper will appear in No. 155. 



2N2 



