CONTENTS. 



PAGB 



Art. I. Analysis of the Volcanic Dust which fell in the Ork- 

 ney Islands on the 2d of September 1845. By 

 Arthur Connell, Esq., Professor of Chemistry in 

 the University of St Andrews. Communicated 



by the Author, 217 



II. On the Origin of Quartz and Metalliferous Veins. 

 By Professor Gustav Bischof, of Bonn. (Con- 

 cluded from vol. xxxix., p. 132), ... 220 



III. Note on the Excrements of certain Insects. By John 



Davy, M.D., F.R.S., Lond. and Edin., Inspector- 

 General of Army Hospitals. Communicated by 

 the Author, 231 



IV. Professor Agassiz, M. J. Durocher, and M. P. 



ScHiMPER, on the Erratic Phenomena of Scandi- 

 navia : — 



I. On some Facts dependent on the Erratic Phenomena 



of Scandinavia. By M. J. Durocheb, . . 234 

 II. Remarks on the Observations of M. Durocher, relative 

 to the Erratic Phenomena of Scandinavia. By Pro- 

 fessor Agassiz, 237 



III. On some Facts dependent on the Erratic Phenomena 



of Scandinavia. By M. P. Schimper, . . 240 



V. On the Chemical Composition of Calcareous Corals. 



By B. SiLLiMAN Jun., 243 



VI. Distribution of Fossils in the different formations, 

 and succession of Animals on the Surface of the 

 Globe. By Professor F. J. Pictet, 

 VII. On the Cause of Storms. By Mr G. A. Rowell. 



Communicated by the Author, . . . 281 

 VIII. M. Adolphe Brongniart and M. Goeppert on the 

 Distribution of Fossil Plants in the different GeO' 

 logical Formations : — 



I, On the great divisions of the Vegetable Kingdom oc- 

 curring in the different Geological Formations. By 

 M. Adolphe Brongniart, .... 285 

 II. General Summary of the Families and Species of Fossil 

 Plants occurring in the different formations. By 



M. Goeppert, 287 



IX. Zoological Principles of Classification, and of the 



Determination of Fossils, .... 289 



X. 1. On the Practicability of reaching by Sea the North 

 Pole. By Captain Sir W. E. Parry, and Sir John 

 Barrow, Bart., late Secretary of the Admiralty. — 

 2. Wliat a Visitor to the Pole ol' the North might 

 obtain in the way of Science. By Sir John Bar- 

 row, Bart. : — 



1. On the Practicability of reaching by Sea the North 



Pole, . : . r \ . .294 



2. What a Visitor to the Pole of the Earth might obtain 



in the way of Science, ..... 297 



