CONTENTS. 



PAGE 



Art. I. On the Palseohydrography and Orography of the 

 Earth's Surface, or the probable position of Waters 

 and Continents, as well as the probable Depths of 

 Seas, and the absolute Heights of the Continents 

 and their Mountain-Chains during the different geo- 

 logical periods. By M. Ami Boue'. Communi- 

 cated by the Author. (Continued from vol. lv., p. 

 316.) . . . .1 



II. On the recent Progress of Ethnology, By Richard 

 Cull, Esq., Honorary Secretary to the Ethnologi- 

 cal Society, and Corresponding Member of the 

 . Historical Institute of France, . .10 



III. On Cohesion of Fluids, Evaporation, and Steam- 



Boiler Explosions. By Lieut. E. B. Hunt, Corps 

 of Engineers, U.S.A. Communicated by the 

 Author, • . . . .26 



IV. Researches in Embryology ; a Note supplementary 



to Papers published in the Philosophical Transac- 

 tions for 1838, 1839, and 1840, shewing the Con- 

 firmation of the Principal Facts there recorded, 

 and pointing out a Correspondence between certain 

 Structures connected with the Mammiferous Ovum 

 and other Ova. By Martin Barry, M.D., 

 F.R.S., F.R.S.E. Communicated by the Author, 36 



