viii CONTENTS. 
Page. 
5, 6, 7, 8, 9. Needle ore.—Platina and gold of the Uralian 
Mountains.—Idocrase in the Isle of Skye.—Chiastolite. 
Antimonial Nickel, 
10, 11. Account of artificial felspar—Crystals of oxide of 
chrome, 
PHYSICS. 
1. New Thermoelectric piles of Nobili, 397 
ASTRONOMY. 
1. Comet of Biela, 398 
MISCELLANEOUS. 
1. Introduction of Frogs into Ireland, 
2, 3. On the rapidity of Vegetable Organization.—How to 
make eatable food from wood, 
-. Htp Some memoranda of errata, having been mislaid, are necessarily omitted. 
