CONTENTS. Ill 



IX. On Malaria, - - - Page 161 



X. Observations on Ground-ice. By the Rev. E. Eis- 



OALE. Communicated by the Author, - 163 T 



XI. Notice of an Earthquake at Saena in Peru. By John 



Reid, Esq. Communicated by the Author, 174 



XII. On some of the Cetacea. By Professor Traill. 



Communicated by the Author, - - 177 * 



XIII. On Workman's Correction of Middle Latitude Sail- 



ing. By William Galbraith, A.M., Teacher 

 of Mathematics, Edinburgh. Communicated by 

 the Author, ----- 180 



XIV. Observations on the Structure of the Brain, &c. 183 



XV. Chemical Analysis of an Indian Specimen of Mesolite. 

 By Robert D. Thomson, M. D. H. E. I. C. S. 

 Communicated by the Author, - - 186 



XVI. Description of several Ne«^ or Rare Plants which 



have lately flowered in the Royal Botanic Garden. 

 By Dr Graham, Professor of Botany in the Uni- 

 versity of Edinburgh, - - - 189 



XVII. Proceedings of the Royal Society of Edinburgh. 



(Continued from Vol. XVI. p. 194.) - 191 



1. On a New Species of Coloured Fringes developed be- 



tween certain pieces of Plate-glass, exhibiting a new 

 variety of polarization, and a peculiar property which 

 renders them available for the purposes of Micrometry. 

 By MuNGo Ponton, Esq. ... 191 



2. A General View of the Phenomena displayed in the 



Neighbourhood of Edinburgh by the Igneous Rocks in 

 their relations with the Secondary Strata ; with refer- 

 ence to a more particular description of the section 

 which has been lately exposed to view on the south 

 side of the Castle Hill. By the Right Hon. Lord 

 Greenock, - - - - . 193 



3. Researches on the Vibrations of Pendulums in Fluid 



Mediums. By George Green, Esq. Communicated 

 by Sir G. Ffrench Bromuead, Bart. - - 194 



4. Observations on the Fossil Fishes lately found in Ork- 



ney. By Dr Traill, . . . .195 



