278 PROCEEDINGS OF THE AMERICAN ACADEMY 



Observations on Days of Unusual Magnetic Disturbance, made at 

 the British Colonial Magnetic Observatories. Vol. I. 1840 to 1844. 

 4to. London. 

 G. B. Airy, Astronomer Royal. 



Fallow's Cape Observations. 4to. (Ext. Mem. R. Ast. Soc, Vol. 

 XIX.) London, 1850. 

 Lieutenant- Colonel Edward Sahine. 



On the Means adopted in the British Colonial Magnetic Observa- 

 tories for determining the Absolute Values, Secular Change, and 

 Annual Variation of the Terrestrial Magnetic Force. By Lieutenant- 

 Colonel Edward Sabine, F. R. S., &c. 4to pamph. London, 1850. 

 Charles Brooke, Esq., F. R. S., Sfc. 



On the Automatic Registration of Magnetometers and Meteoro- 

 logical Instruments by Photography. By Charles Brooke, F. R. S., 

 &c. 4to pamph. London, 1850. 

 Royal Institution of Great Britain. 



List of Members, Officers, &c., with the Report of the Visitors 

 of the Royal Institution of Great Britain, for the Year 1849. 8vo 

 pamph. London, 1850. 

 John Kinnersley Smithies. 



Essay on the Theory of Attraction. By John Kinnersley Smithies. 

 4to pamph. London, 1850, 

 Henry Raper, R. N. 



The Practice of Navigation and Nautical Astronomy. By Henry 

 Raper, R. N. Third Edition. 8vo. London, 1849. 

 Professor William R. Hamilton, LL. D. 



Law of the Circular Hodograph ; or on a New Mode of geomet- 

 rically conceiving, and of expressing in Symbolical Language, the 

 Newtonian Law of Attraction. By Prof. Wm. R. Hamilton, LL. D. 

 (Extract from the Proceedings of the Royal Irish Academy, Vol. 

 III.) 8vo pamph. 

 Professor Oioen, F. R. S. 



On the Development and Homologies of the Molar Teeth of the 

 Wart Hogs (Phacochferus), with Illustrations of a System of Nota- 

 tion for the Teeth of the Class Mammalia. By Professor Owen, 

 F. R. S., &c. (Extract of the Phil. Trans. R. S., Pt. II., 1850.) 4to. 

 Adam Sedgwick, F. R. S., ^c. 



A Discourse on the Studies of the University of Cambridge. By 

 Adam Sedgwick, M. A., &c. Fifth Edition, with Additions and 

 Preliminary Dissertation. 8vo. Cambridge, 1850. 



