11 CONTENTS. 



PAGE 



VIII. On the Destruction and Partial Reproduction of 

 Forests in British North America. By John 

 William Dawson, Esq. of Pictou. Communicated 

 by the Author, . . . .259 



IX. On the Tertiaries of the Island of Cos. By Profes- 

 sor Edward Forbes. With a Plate of Fossil 

 Shells, . . . . .271 



X. Analysis of Pottery made by the Red Indians of North 

 America. By Mr John Macadam of Glasgow, 

 Laboratory Assistant to Dr George Wilson, 

 F.R.S.E., Edinburgh. Communicated by the 

 Royal Scottish Society of Arts, . . 275 



XI. On the Minhocao of the Goyanese, an enormous species 

 of Lepidosiren 1 By M. Auguste de Saint Hi- 

 LAIRE, . . . . 278 



XII. On the Co-Existence of Ovigerous and Spermatic Cap- 

 suleson the same Individuals of the Hydra viri- 

 dis. By Allen Thomson, M.D., F.R.S.E., Pro- 

 fessor of Physiology in the University of Edin- 

 burgh. Communicated by the Author. With a 

 Plate. .... 281 



XIII. On the Glacial Theory, and the Effects of Glacial Ac- 



tion. Communicated by the Author, . 289 



XIV. Facts relating to the Great North American Lakes. 



By Professor C. Deway, . . 295 



XV. On Guano (Huanu), ... 298 



XVI. On Coca (Erythroxylon Coca, Lam.). By Dr J. J. 



Von Tschudi, ... 301 



XVII. An Account of the Mining Academies of Saxony and 

 Hungary. By Warrington W. Smyth, M.A., 

 Cambridge, Mining Geologist to the Geological 

 Survey of the United Kingdom. From a copy 

 communicated by the Author, . . 309 



