vm 



CONTENTS. 



XXVI. On the Theory of Warns. Part I. By The Rev. P. Kelland, 

 M.A., F.R.SS.L. 8f E., F.C.P.S., late Fellow of Queen's College, 

 Cambridge; Professor of Mathematics, Sfc. in the University of 

 Edinburgh, . . . . . . . . . 497 



XXVII. Account of Experiinental Observations on the Development and Growth 

 of Salmon-Fry, from the exclusion of the Ova to the age of two 

 years. By Mr John Shaw, Drumlanrig. Communicated by 

 James Wilson, Esq. F.R.S.E. 547 



XXVIII. On General Differentiation. Part I. By The Rev. P. Kelland, 

 M.A., F.R.SS.L. Sf E., F.C.P.S., late Fellow of Queen's College, 

 Cambridge ; Professor of Mathematics, <|c. in the University of 

 Edinburgh, ......... 567 



XXIX. On General Differentiation. Part II. By The Rev. P. Kelland, 

 M.A., F.R.SS.L. S^E., F.C.P.S., late Fellow of Queen's College, 

 Cambridge ; Professor of Mathematics, SfC. in the University of 

 Edinburgh, ......... C<M 



XXX. On Sulphuret of Cadmium, or Greenockite, a new Mineral. By Ae- 



THUE Connell, Esq., F.R.S.E. 619 



XXXI. Solution of a Functional Equation, tvith its Application to the Paral- 

 lelogram of Forces, and to Curves of Equilibration. By William 

 Wallace, LL.D., F.R.S.E., F.R.A.S., M Camh. Phil. S., Hon. 

 M. Inst. Civ. Engin., Emeritus Professor of Mathematics in the 

 University of Edinburgh, ....... G25 



XXXII. Documents sur les Dykes de Trap d\me partie de Vllle d'Arran. Par 

 Mons L. A. Neckee, Professeur Honoraire de Mineralogie et de 

 Geologic a V Academic de Geneve, 8^c. ..... 677 



XXXIII. An Account of the Iron Mines of Caradogh, near Tahreez in Persia, 

 and of the Method there practised of producing Malleable-Iron by a 

 single process directly from the Ore. By James Robeetson, Civil 

 and Mining Engineer, Major Persian Service, and late Director of 

 the Shah's Ordnance Works, Persia ; Cor. M. W. S., and Cor. F. 

 A.SS 6.99 



