CONTENTS. 



PART I. (1864-65.) 



II. On the Cause and Cure of Cataract. By Sir David Brewster, K.H 

 F.R.S., ....... 



III. On Hemiopsy, or Half- Vision. By Sir David Brewster, K.H., F.R.S. 



IV. Miscellaneous Observations on the Blood. By John Davy, M.D 



F.R.S., Lond. and Edin., &c, .... 



PAGE 



I. On the Principle of Onomatopoeia in Language. By Professor Blackie, 1 



11 

 15 



19 



V. A Study of Trilinear Co-ordinates : being a Consecutive Series of 



Seventy-two Propositions in Transversals. By the Rev. Hugh 

 Martin, M.A., Free Greyfriars', Edinburgh. Communicated by 

 Professor Kelland, . . . . . .37 



VI. Note on Confocal Conic Sections. By H. F. Talbot, Esq., , . 53 



VII. On the Motion of a Heavy Body along the Circumference of a Circle. 



By Edward Sang, Esq., . . . . • .59 



VIII. Experimental Inquiry into the Laws of the Conduction of Heat in Bars. 

 Part II. On the Conductivity of Wrought Iron, deduced from the 

 Experiments of 1851. By James D. Forbes, D.C.L., LL.D., 

 F.R.S., V.P.R.S. Ed., Principal of St Salvator and St Leo- 

 nard's College, St Andrews, and Corresponding Member of the 

 Institute of France. (With five Plates, L-V.), . . 73 



IX. Some Observations on the Cuticle in relation to Evaporation. By John 



Davy, M.D., F.R.SS. Lond. and Edin., . . .111 



X. On the Contact of the Loops of Epicycloidal Curves. By Edward Sang, 



Esq. (With seven Plates, VI.-XIL), . . . .121 



