CONTENTS. Ill 



PAGE 



Art. XIV. M. B. Lewy's Expedition to New Granada. 

 1. Geology and Mineralogy, especially the remark- 

 able Discovery of the Geological Position of the 

 Emeralds of Muzo. 2. New Animals and Plants of 

 that Country, . . . . . . 130 



Geology and Mineralogy, . . . . 130 



Zoology, 133 



Botany, ...... 134 



XV. Of the Occurrence of the Remains of the Rein-deer in 

 Scotland. By John Scouler, M.D., F.L.S., 

 Communicated by the Author, . . . 135 



XVI. On certain New Applications of Prisms. By the Rev. 

 W. Hodgson, Old Brathay, Ambleside. With a 

 Plate. Communicated by the Author, . 137 



XVII. Geological Notes. By Professor Silliman, Junior, 141 



1. Grotto del Cane and Lake Agnano, . . 141 



2. Sulphur Lake of the Campagna, near Tivoli, . 142 



3. Present Condition of Vesuvius, . . . 144 



4. Meteorological Observatory of Mount Vesuvius, 146 



5. Fish of Mont Bolca, . . . . I47 



6. Mineralogical Notes, . . . . 147 



XVIII. Observations on the Zodiacal Light ; with an In- 

 quiry into its Nature and Constitution, and its * 

 Relations to the Solar System. By Denison 

 Olmsted, Professor of Natural Philosophy and 

 Astronomy in Yale College. With a Plate. Read 

 before the American Association for the Advance- 

 ment of Science, at the Annual Meeting at Al- 

 bany, August 1851, .... 148 



Nature and Constitution of the Zodiacal Light, . 156 



XIX. Concerning the Successive Appearance and Disap- 

 pearance of Great Glaciers upon the present Sur- 

 face of the Terrestrial Globe. Extract of a Letter 

 from M. A. DE la Rive to M. Arago, . 156 



