iv CONTENTS. 
New Proof of the Cantal being a crater of Sou- 
levement. 5. On the Cause of the Colours in 
Precious Opal. By Sir David Brewster. 6. On 
Crystals in the cavities of Topaz, which are 
dissolved by heat, and re-crystallize on cooling. 
By Sir David Brewster, 
BOTANY AND ZOOLOGY. 
7. Distribution of Plants on Mount Canigou, Hast- 
ern Pyrenees. 8. On solid Vegetable Oils. 
9. On the Ibis, : h : : 
Art. XXIII. New Publications, 
XXIV. List of Patents for LiivelhiiMe granted for 
Scotland from 24th January to 20th 
March 1845, inclusive, : E 
INDEX, 
Errata in Mr King’s paper on the Genus Sigillaria, in the last Number. 
Page 131, line 6 from the top, for Endogens read Cryptogams. 
» » line 12 from the top, dele of this class. 
ss 182, line 5 from the top, for Monocotyledons vead plants. 
» 134, line 2 from the bottom, for Kenilworth read Killingworth. 
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