I. “On some Varieties of Tannin.” By John Stenhouse, LL. D., F. R. S. (See p. 401.) II. “On Larixinic Acid, a crystallizable volatile principle found in the Bark of the Larch Tree” ( Pinus Larix , Linn.). By John Stenhouse, LL. D., F. R. S. (See p. 405.) 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 Lamellibranchiate 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. Hofmann, 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 Bose. (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. B rodie, Esq., F. R. S., Professor of Chemistry in the University of Oxford. (See p. 442.)