TO CORRESPONDENTS.* 



Communications have been received from Mr. D. Forbes, Prof. Cayley, 

 and Mr. J. J. Waterston. 



Errata. 



Page 248, line 8, for heat read cloud. 

 — 252, fig. 2, the line P, and not I P, should have been produced. 



In 3 vols. 8vo, with numerous Woodcuts, price £'6 13s. cloth, 

 A TREATISE ON ELECTRICITY, IN THEORY AND PRACTICE. 

 By A. De la Rive, 

 Late Professor in the Academy of Geneva. 



Translated for the Author by C V. Walker, F.R.S. 

 " One of the best text-books of electricity to be found in Europe."— Athenceum. 

 London : Longman, Green, and Co., Paternoster Row. 



CHEMISTRY-UNIVERSITY COLLEGE, LONDON. 



An ELEMENTARY COURSE of THEORETICAL and PRACTICAL 

 INSTRUCTION in CHEMISTRY, by PROFESSOR WILLIAMSON, as- 

 sisted by Mr. Gill, will commence on the 1st of May. The Course will consist of 

 about Forty-eight Lessons, and will include the subjects of the Matriculation 

 Examination of the University of London. It will terminate by the 24th of June. 



Fee for the Course, Four Pounds, including cost of material and apparatus. 

 On Payment of 5s. College Fee in addition, the Course is open to gentlemen who 

 are not attending other classes in the College. 



John R. Seeley, M.A., Dean of the Faculty of Arts and Laws. 

 Charles C. Atkinson, Secretary to the Council. 

 March 1, 1865, 



BRITISH METEOROLOGICAL SOCIETY. 



No. 17 of the PROCEEDINGS of the METEOROLOGICAL SOCIETY, 

 price 2s., containing the Communications made at the Meeting on February 15. 



Jas. Glaisher, F.R.S., j « 

 C. V. Walker, F.R.S., [ Secretaries. 



*% The Composition Fee is j£10 ; the Annual Contribution <€l. The 



Entrance Fee is abolished. 



Taylor and Francis, Red Lion Court, Fleet Street, E.C. 



Price Two Shillings and Sixpence. 



MATHEMATICAL aUESTIONS 



Proposed at the Examination for Admission to the 



ROYAL MILITARY ACADEMY, WOOLWICH, 



Held on the 4th January 1864, and following days; 



WITH COMPLETE SOLUTIONS. 



By J. F. Heather, M.A., 



Late Mathematical Master at the Royal Military Academy. 



Taylor and Francis, Red Lion Court, Fleet Street, E.C. 



[ADVERTISEMENTS continued on 3rd page of Cover. 





