CONTENTS. 



Page 

 Art. I. Historical Eloge of Antoine-Laurent Jussieu. By 

 M. Flourens, Perpetual Secretary of the Aca- 

 demy of Sciences of France, • • ^ 

 II. On the comparative merits of the Reflecting Micro- 

 scope of Sir David Brewster, and the Catadiop- 

 tric Engiscope of Professor Amici of Modena ; 

 with an account of a new Reflecting Telescope 

 for Terrestrial Objects. By Charles R. Go- 

 ring, M.D. Communicated by the Author, 31 



III. On the Expansive Action of Steam in some of the 



Pumping Engines on the Cornish Mines. By 

 William Jory Henwood, F.G.S., Secretary of 

 the Royal Geological Society of Cornwall, H.M. 

 Assay-Master of Tin in the Duchy of Cornwall, 42 



IV. On Water-Spouts. By Hans Christian (Ersted, 



Professor of Natural Philosophy in the Univer 

 sity of Copenhagen, 

 General nature of Water Spouts, 

 Form of the Water-Spout, 

 Dimensions of Water-Spouts, 

 Colour and Transparency of W:.ter-Spouts, 

 Duration and Movements of Water-Spoiits, 

 Power of Watcr-Spouts, 

 Sound and Smell of Water-Spouts, 

 Formation and Phenomena of Water-Spouts, . 61 



On the actual nature of a Water-Spout, . • 63 



V. Experiments and Observations on the Temperature 

 of Artesian Springs or Wells, in Mid-Lothian, 

 Stirlingshire, and Clackmannanshire. By Ro- 

 bert Paterson, M.D., M.W.S. Communicated 

 by the Author, . . • • ^^ 



VI. Memoir on the Classification of Soils. By M. De 



Gasparin, . . . ' • °'^ 



1. On the Principles of the Classification of Soils, 86 



2. The Cliaracters of Soils in relation to Agi'iculture, 88 



3. Relative value of Characters, • • 89 



4. Primary Classification of Soils after their appro])ria- 



tion to particular cultures, . . • 91 



VII. On the Geographical Distribution of Insects, . 94 



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 57 

 59 



