446 



III. " On the Great Magnetic Disturbance of August 28 to 

 September 7, 1859, as recorded by Photography at the 

 Kew Observatory." By BALFOUR STEWART, Esq., A.M. 

 (See p. 407.) 



IV. " On the Aquiferous and Oviducal System in the La- 

 mellibranchiate Mollusks." By GEORGE ROLLESTON, 

 M.D., and C. ROBERTSON, Esq. (See p. 411.) 



V. " Notes of Researches on the Poly- Ammonias/' No, XVI. 



Triatomic Ammonias. By A. W. HOFMANN, LL.D., 

 F.R.S. (See p. 413.) 



VI. " Notes of Researches on the Poly-Ammonias." No. 



XVII. Mixed Triammonias containing Monatomic and 

 Diatomic Radicals. By A. W. HOFMANN, LL.D., F.R.S. 

 (See p. 420.) 



VII. " Notes of Researches on the Poly- Ammonias." No. 



XVIII. Tetrammonium Compounds. By A. W. HOF- 

 MANN, LL.D., F.R.S. (See p. 423.) 



VIII. " On the Lead-Zinc and Bismuth-Zinc Alloys." By 

 A. MATTHIESSEN, Esq., F.R.S., and M. VON Boss. 

 (See p. 430.) 



IX. "On some Gold-Tin Alloys." By A. MATTHIESSEN, 

 Esq., F.R.S., and M. VON BOSE. (See p. 433.) 



X. " On the Sensory, Motory, and Vaso-motory Symptoms 



resulting from the Refrigeration of the Ulnar Nerve." 

 By AUGUSTUS WALLER, M.D., F.R.S. (See p. 436.) 



XI. " Note on the Oxidation and Disoxidation effected by 

 the Peroxide of Hydrogen." By B. C. BRODIE, Esq., 

 F.R.S., Professor of Chemistry in the University of 

 Oxford. (See p. 442.) 



XII. " On the Contact of Curves." By WILLIAM SPOTTIS- 

 WOODE, Esq., M.A., F.R.S. Received October 15, 1861. 



(Abstract.) 



In a paper published in the ' Philosophical Transactions ' for 1859, 

 p. 371, Mr. Cayley has investigated the theory of the conic of five 



