^.j£j CONTENTS. 



XXVI. Off the Theory of Waves. Part I. By The Rev. P. Kelland, 

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

 Camhridqe ; Pro/essor of Mathematics, SfC. in the University of 

 Edinburgh, 497 



XXVII. Account of Experimental Observations on the Development and Growth 

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

 years. By Mi' John Shaw, Drumlanrig. Communicated by 

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



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

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

 Cambridge ; Professor of Mathematics, &f. in the University of 

 Edinburgh, 5G7 



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

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

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

 Edinburgh, 604 



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

 thur Connell, Esq., F.R.S.E. G19 



XXXI. Solution of a Functional Equation, uith 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., 31. Camb. Phil. S., Hon. 

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

 University of Edinburgh, ....... C25 



XXXII. Documents sur les Dykes de Trap d'une partie de Vllle d^Arran. Par 

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

 Geologic a P Academic de Geneve, S^c. ..... 677 



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

 and of the 3Iethod there practised of producing 3Ialleable-Iron by a 

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

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

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

 A.SS. 6.09 



