TABLE OF CONTENTS. 



NUMBER XXV.— JANUARY. p^^^ 



Dr. Bigsby's Sketch of the Topography and Geology of Lake 



Ontario 1 



Capt. B. Hall's Letter inclosing a Communication from Peter 

 S. Du Ponceau, Esq. of Philadelphia, on some Points con- 

 nected with the Nature of the Chinese Language 15 



Mr. Ivory on the Method of deducing the Difference of Lon- 

 gitude from the Latitudes and Azimuths of two Stations on 



the Earth's Surface 24 



Prof. Encke on Literpolation 28 



Mr. Children's Abstract of the Characters of Ochsenheimer's 

 Genera of the Lepidoptera of Europe ; with a List of the 

 Species of each Genus, and Reference to one or more of 



their respective Icones {continued) 36 



Mr. Bevan on the superior Qualities of the Ash Timber which 



grows at Earls Barton, in Northamptonshire 51 



Dr. Tiarks on the Longitudes of the "Trigonometrical Survey of 



England 52 



New Books: — Mr. Forsyth's First Lines of Philosophical and 

 Practical Chemistry; — Osburn's Account of an Egyptian 

 Mummy, presented to the Museum of the Leeds Philosophi- 

 cal and Literary Society, by the late John Blayds, Esq. . 54 — 65 



Proceedings of the Ro)'al Society 65 



■ Linnfean Society 73 



Decease of Dr. Wollaston — Scientific Books 74< 



Lectures at Mechanics' Institution 76 



Aurora Borealis — New Patents , 77 



Meteorological Observations 78 



. .. • made by Mr. Booth at the Garden 



of the Horticultural Society at Chiswick, near London, by 

 Mr. Giddy at Penzance, Dr. Burney at Go^port, and Mr. 

 Veall at Boston 80 



NUMBER XXVI— FEBRUARY. 



Dr. Bigsby's Sketch of the Topography and Geology of Lake 

 Ontario [continued) 81 



Sir G Cayley on the Natural Zero, according to Fahrenheit's 

 Scale 88 



Prof. Encke on Interpolation {concluded) 91 



Mr. F. Baily on the Discordancies in the Results of the Me- 

 thods for determining the Length of the simple Pendulum 97 



Mr, Ivory's Observations on Mr. Meikle's Reply, published in 

 the last Number of the Quarterly Journal of Science 104' 



Mr. Ivory on the Method of deducing the Difference of Longi- 

 tude from the Azimuths and Latitudes of two Stations, . . . 106 



Dr. 



