neoits CONTENTS. 
PAGE 
XXIII. Chemical Notices. By ALEXANDER Kemp, Esq., 
Teacher of Practical Chemistry, and Assistant to 
Dr Gregory, in the University of Edinburgh. 
Communicated by the Author :-— 
1. On the Purification of Oil of Vitriol from Nitric 
Acid, 3 : ; , ; 
2. On the Absence of Iron in Hydrochloric Acid, pre- 
pared by Professor Gregory’s process, - 356 
354 
XXIV. Screntiric INTELLIGENCE :—— . 
ASTRONOMY. 
1. On the Extinction of Light in the Atmosphere. By 
W. 8. Jacob, Esq., H.H.I.C. Astronomer, Madras. 
Communicated by Professor Piazzi Smyth, . 357 
METEOROLOGY. 
2, Climate of Australia. By John Gould, Esq., F.R.S., 
RGIS, acy : : . 358 
} GEOLOGY. 
3. On the Volcanic Formations of the Alban Hills, 
near Rome. By Prof. J. D. Forbes. 4. On Infu- 
sorial Deposits on the River Chutes in Oregon. 
By M. Ehrenberg, : : 3 360- 362 
ZOOLOGY. 
5. Low State of Development of Mammals and Birds 
in Australia and New Zealand. 6. Migratory 
Birds of Australia, &c., 3 , 362-364 
BOTANY. 
7. On the Gamboge Tree of Siam. By Dr Christison, 364 
AGRICULTURE. 
8. Analysis of Soils. 9. Notes on American Agricul- 
ture, : . E : : 366-3 67 
MISCELLANEOUS. 
10, Funeral Obsequies of the celebrated Danish Poet, 
Oehlenschlager. 11. Glass as a Non-conductor. 
12, Mean Annual Export of Wool from the Farée 
Islands. 13. Outline of the Tamil System of Na- 
tural History, . 5 > : 368-370 
XXV. List of Patents granted for Scotland from 20th De- 
cember 1849 to 22d March 1850, f ; 370 
INDEX, . : ; : : ; . . 377 
