CONTENTS. 



PAGE 



Art. I. Biography of M. D'Aubuisson de Voisinis, Engineer- 

 in-Chief and Director of Mines. By M. De 

 BoucHEPORN, Mining Engineer, ... 1 



II. Some additional Observations on the Urinary Excre- 

 ment of Insects. By John Davy, M.D., F.R.S., 

 Lond. & Ed., Inspector-General of Army Hospi- 

 tals. Communicated by the Author, . . 17 



III. On the Erratic Basin of the Rhine. By M. A. Guyot. 



Communicated by the Author, ... 20 



IV. On the Depth and Saltness of the Ocean, . . 27 



V. Notice of Carbonate of Copper and Zinc from Mat- 

 lock. By Professor A. Connell. Communi- 

 cated by the Author, ..... 36 



VI. On the Comparative Value of different Kinds of Coal 

 for the purpose of Illumination ; and on Methods 

 not hitherto pi-actised for ascertaining the Value 

 of the Gases they afford. By Andrew Fyfe, 

 M.D., F.R.S.E., F.R.S.S.A., Professor of Che- 

 misti-y, King's College University, Aberdeen, &c. 

 Communicated by the Royal Scottish Society of 

 Arts, 37 



1. Quality of the Gases, ■ • • • 37 



2. Value of Coals for the purpose of Illumination, 42 



3. Expense for Light by Diflferent Gases, . . 44 

 Oonsumpt of Gases under different Pressures, 48 



