CONTENTS. Ill 



13'N ; height above the sea 180 feet; distance 

 from the sea 10 miles. Times of Observation, 

 9 A.M. and 9 p. ji. By the Rev. William Dun- 

 bar. Communicated by the Author, . 112 



XVII. Researches on the Structure of the Scales of Fishes. 



ByDrL. Mandl, . . 113 



Historical, . . . . . ,113 



Scales considered as affording Characters for Classification, 122 



XVIII. Report on the Manufacture of Tea, and on the Ex- 

 tent and Produce of the Tea- Plantations in Assam. 

 By C. A. Bruce, Esq. Superintendent of Tea- 

 Culture. With a Map of the Tea Districts, 126 



XIX. On the Calcareous and Siliceous Microscopic Ani- 

 mals which form the Chief Component Parts of 

 Cretaceous Rocks. By Professor C. G. Ehken- 

 BERO, . . . . . 161 



XX. On the Extinction of Human Races. By Dr Prit- 



CHARD, . . . . 166 



XXI. On the Geographical Distribution of Insects. (Con- 

 tinued from vol. 27, p. 351), . . 170 



XXII. On the Inflammable Gases of the Prussian Coal 



Mines. By Professor Gustav Bischof, . 183 



XXIII. Description of a Polyphotal Lamp, and Reflector of 



Single Curvature, employed in Steam-vessels, 

 Canal-boats, &c. By John Scott Russell, A. M., 

 F. R. S. E., V. P. S. A., Communicated by the 

 Society of Arts, . . . .193 



XXIV. Presentation of the Royal Society Medals to Dr M. 



Barry and Mr Ivory, and the Copley Medal to 

 Mr Brown. By the President Lord Northamp- 

 ton, ..... 196 



XXV. Fossil Organic Remains in Transition Rocks in the 



Great Southern High-Land of Scotland, . 198 



XXVI. Proceedings of the Wernerian Natural History 



Society. (Continued from vol. xxvi. p. 429), 199 



