CONTENTS. Ill 



PAGE 



XVII. On the Theory of Dew. By M. Melloni ; in Two 



Letters to M. Arago, . . . .128 



XVIII. On the Relations which exist between the Phenomena 

 of Erratic Blocks in Northern Europe and the 

 Elevations of Scandinavia. By M. Desor, . 141 



XIX. On the Meaning originally attached to the term " Cam- 

 brian System," and on the evidence since obtained 

 of its being geologically synonymous with the pre- 

 viously established term *' Lower Silurian." 

 By Sir Roderick I. Murchison, G.C. St S., 

 V.P.G.S., F.R.S., &c., .... 147 



XX. On the Protein Question. By Professor Mulder of 

 Utrecht. Communicated by Professor J. F. W. 

 Johnston, ...... 162 



XXI. Important Information regarding the Cultivation of 



Tea in the Valley of the Dhoon, India, . 170 



XXII. On the Occurrence of Stones on the surface of Gla- 

 ciers, as connected with Glacier Stratification. In 

 a Letter to Professor Jameson by M. E. Desor, 172 



XXIII. On the Manna of the Scriptures, . . .176 



XXIV. On the Temperature of the Geyser Springs in Ice- 

 land, 179 



XXV. On the Origin of the Sand-hillocks of St Ives Bay, 

 Whitesand Bay, and Mount's Bay. By Richard 

 Edmonds, jun., Esq., ..... 181 



XXVI. Scientific Intelligence : — 



GEOLOGY AND MINERALOGY. 



1. Example of apparent Drift-Furrows dependent on 

 Structure. By C. B. Adams, State Geologist of Ver- 

 mont, &c. (Communicated for this Journal.) 2. Food 

 of the Mastodon. (Proc Bost. Nat. Hist. Soc.) 3. 

 Large Plates of Mica. 4. Lake Baikal. 5. Chiolite, 



