CONTENTS. »" 



XVI. On the Mineralogical Nature of Terrestrial, Fluvia- 



tile, and Marine Shells. By M. L. A. Necker, 160 

 XVII. On an interesting mode of occurrence of Calcareous 

 Spar in Basalt Tuffa. By William Haidingeb, 

 Esq., F.R.S.E., and M.W.S., • • 163 



XVIII. A new method of Reshipping a Rudder at Sea, and 

 that with ease even in stormy weather. By Mar- 

 TYN J. Roberts, Corresp. Mem. R.G.S. of Corn- 

 wall, M.L.E.S., &c. Communicated by the So- 

 ciety of Arts, .... 166 

 XIX. Notice of a cheap and simple method of preparing 

 paper for Photographic Drawing, in which the 

 use of any salt of silver is dispensed with. By 

 MuNGO Ponton, Esq., F.R.S.E. Communicated 

 by the Society of Arts, . • .169 

 XX. Address to the Geological Society of London, de- 

 livered at the Anniversary, on the 15th of Febru- 

 ary 1839. By the Rev. William Whewell, 

 B.D., F.R.S., President of the Society, . 171 



Descriptive Geology.— 1. Home (North European) 

 Geology.— 2. Foreign (South European and Trans-Euro- 

 pean) Geology, • • • • 172-178 

 Paleontology, ..... 179 

 Geological Dynamics, .... 184 



XXI. Description of several New or Rare Plants which 

 have lately flowered in the Neighbourhood of 

 Edinburgh, and chiefly in the Royal Botanic Gar- 

 den. By Dr Graham, Professor of Botany, 189 

 XXII. Proceedings of the Royal Society of Edinburgh, 195 

 1 On the Colour of Steam under certain circumstances. 

 By Professor Forbes.- 2. On the Meaning of the Ho- 

 meric terms, ^£/</<r, hxv, ■ri/x.n, ■rnvn, with the more im- 

 portant compounds and derivatives. By the Vene- 

 rable Archdeacon Williams.— 3. The colours of the 

 Atmosphere considered with reference to a paper " On 

 the Colour of Steam under certain circumstances," 

 read at the previous meeting of the Royal Society. 

 By Professor Forbes. — 4. Notice of some observations 

 made during the Storm of January 1839. By John 

 Scott Russell, Esq.— 5. On Fresuel's Law tor the 

 Intensity of Reflected and Refracted Light. By Pro- 

 fessor Kelland.— 6. On a new Galvanic Battery, and 

 an improved Voltameter. By Martyn Roberts, 

 Esq. Communicated by Sir John Robison.— 7. Notice 

 upon the Alcoholic Strength of Wines. By Dr 

 Christison.— 8. Notice respecting the Drying-up ot 

 the Rivers Tcviot, Clyde, and Nitli, and their tribu- 

 taries, on the 27th November 1838. By David 



