ii CONTENTS. 



Page 

 Art. IX. Major-General Sir Howard Dougl\s, Bart. &c. on 



Military Bridges, and the Passage of Rivers in Mi- 

 litary Operations, - - - 285 

 X. Experiments on the Expansion and Contraction of 

 Building Stones, by Variations of Temperature. 

 By William H. C. Bartlett, Lieutenant United 

 States Engineers, - - - - 304 

 XI. Observations on Saline Crystallization. By Henry 

 Ogdex, M. D., Extraordinary Member of the Royal 

 Medical Society of Edinburgh. Communicated by 

 the Author, . - - _ 309 

 XII. On the Magnitude of the Ultimate Particles of Bodies ; 

 Infusory Animals not formed immediately from 

 Dead Matter; Extraordinary Minuteness of the 

 Infusoria ; Improved Arrangement of the Infuso- 

 ria; Marvellous Multiplication of the Infusoria; 

 Estimate of the relative Value of the Microscopes 

 of Chevalier, Ploessel, and Schick. By Prof C. 

 G. Ehrenberg of Berlin, - - - 319 

 XII. Outline of the. Geology of the Bhurtpoor District. 

 By James Hardie, Esq. Bengal Medical Esta- 

 blishment. Communicated by the Author, - 328 

 XIV. Meteorological Tables, deduced from a Register of 

 the Weather, kept at Bancoorah in the East 

 Indies, during the Years 1827 and 1828, - 337 

 XV. On the Graphite or Black-Lead of Ceylon, - - 3^6 



XVI. Analysis of several Indian, Chinese, and New^ Hol- 



land Coals. By J. Prinsep, Esq. Secretary to the 

 Physical Class of the Asiatic Society of Calcutta, 347 



XVII. On the Fossil Flora, - - - - 349 

 XVIII. Notice by Dr Graham of Botanical Excursions into 



the Highlands of Scotland from Edinburgh this 

 season, - - - - - - 350 



XIX. Description of several New^ or Rare Plants which 

 have lately flowered in the neighbourhood of 

 Edinburgh, and chiefly in the Royal Botanic 

 Garden. By Dr Graham, Professor of Botany 

 in the University of Edinburgh, - - 36l 



XX. Celestial Phenomena from October 1. 1832 to January 

 1. 1833, calculated for the Meridian of Edin- 

 burgh, Mean Time. By Mr George Innes, As- 

 tronomical Calculator, Aberdeen, - - 365 



