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Contributions to the History of the Phosphorus-Bases. Parts L. 

 II. and III. By A. W. Hofmann, LL.D., F.R.S 568 



On Boric Ethide. By Edward Frankland, Ph.D., F.E.S. and B. 

 Duppa, Esq 568 



On Format's Theorems of the Polygonal Numbers. First Communi- 

 cation. By the Right Hon. Sir Frederick Pollock, F.R.S 571 



On Cyanide of Ethylene and Succinic Acid. Preliminary Notice. 

 By Maxwell Simpson, Ph.D 574 



Results of Researches on the Electric Function of the Torpedo. By 

 Professor Carlo Matteucci, of Pisa 576 



Natural History of the Purple of the Ancients. By F. J. H. Lacaze- 

 Duthiers 579 



Contributions towards the History of Azobenzol and Benzidine. By 

 P. W. Hofniann, Ph.D 585 



On Bromphenylamine and Chlorphenylamine. By E. T. Mills .... 589 



New Compounds produced by the substitution of Nitrogen for Hy- 

 drogen. By P. Griess 591 



Contributions towards the History of the Monamines. No. III. 

 Compound Ammonias by Inverse Substitution. By A. W. Hof- 

 mann, LL.D., F.R.S 594 



Notes of Researches on the Poly- Ammonias. No. IX. Remarks on 

 anomalmts Vapour-densities. By A. W. Hofmann, LL.D., F.R.S. 596 



Notes of Researches on the Poly-Ammonias. No. X. On Sulph- 

 amidobenzamine, a new base. By A. W. Hofmann, LL.D., F.R.S. 598 



Researches on the Phosphorus-Bases. No. VIII. Oxide of Tri- 

 ethylphosphine. By A. W. Hofmann, LL.D., F.R.S 603 



Researches on the Phosphorus-Bases. No. IX. Phospharsonium 

 Compounds. By A. W. Hofrnann, LL.D., F.R.S 608 



Researches on the Phosphorus-Bases. No. X. Metamorphoses of 

 Bromide of Bromethylated Triethylphosphonium. By A. W. 

 Hofmann, LL.D., F.R.S 610 



Researches on the Phosphorus-Bases. No. XI. Experiments in 

 the Methyl- and in the Methylene-Series. By A. W. Hofmann, 

 LL.D., F.RS 613 



Researches on the Phosphorus-Bases. No. XII. Relations between 

 the Monoatomic and the Polyatomic Bases. By A. W. Hofmann, 

 LLD., F.R.S 619 



On the Laws of the Phenomena of the larger disturbances of the 

 Magnetic Declination in the Kew Observatory : with notices of 

 the progress of our knowledge regarding the Magnetic Storms. 

 By Major-General Edward Sabine, R.A., Treas. and V.P.R.S. . . 624 



On the Physiological Anatomy of the Lungs. By James Newton 

 Heale, M.D 645 



