CONTENTS. vii 



PART II. L hlCLA 



XVII. Results of Observations made with WhewelVs Anemometer. By Mr 



John Rankine. Communicated hy Professor Forbes, . 359 



XVIII. On the Colour of Steam under certain circumstances. By James D. 

 Forbes, Esq., F.R.SS.L. Sf Ed., Professor of Natural Philosophy 

 in the University of Edinburgh, ...... 371 



XIX. The Colours of the Atmosphere considered with reference to a previous 

 Paper " On the Colour of Steam under certain circumstances.'''' By 

 James D. Forbes, Esq., F.R.SS.L. ^ Ed., Professor of Natural 

 Philosophy in the University of Edinburgh, . . . . 375 



XX. On FresneVs Formulce for the Intensity of Reflected and Refracted 

 Light. By Philip Kelland, M. A., late Fellow of Queen's Col- 

 lege, Cambridge, Professor of Mathematics, SfC, in the University 

 of Edinburgh, 393 



XXI. On the Composition of a New Writing Ink., which, in resisting Che- 

 mical Deletion, promises to diminish the chance of the Falsification 

 of Bills, Deeds, and other Documents. By Thomas Stewart 

 Traill, M.D., F.R.S.Ed. Sfc, Professor of Medical Jurispru- 

 dence in the University of Edinburgh, . . . . . 419 



XXII. Investigation of Analogous Properties of Co-ordinates of Elliptic and 

 Hyperbolic Sectors. By William Wallace, LL.D., F.R.S.E., 

 F.R.A.S., M. Cambridge P. S., Sfc, Emeritus Professor of Mathe- 

 matics in the University of Edinburgh, . . . . . 431 



XXIII. Notice respecting the Depletion or Drying-up of the Rivers Teviot, 



Nith, and Clyde, on the 27th November 1838. By David Milne, 

 Esq., F.R.S.E., F.G.S 449 



XXIV. Notice of Two Storms which swept over the British Islands during the 



last iveek of November 1838. By David Milne, Esq., F.R.S.E., 

 F.G.S. .......... 467 



XXV. On the Diminution of Temperature with Height in the Atmosphere, at 

 different seasons of the year. By Jajvies D. Forbes, Esq., 

 F.R.SS.L. 8f E., Professor of Natural Philosophy in the University 

 of Edinburgh, 489 



iNl 



