CONTENTS. 
iii 
Art. XVII. On the Diurnal Variation of the Needle. By Sa- 
muel Hunter Christie, Esq. M.A. - 164 
XVIII. Description of a new species of Pecten, from the 
Outer Hebrides. By Mr W. Macgillivray, 
Corresponding Member of the Wernerian Na- 
tural History Society, - - 166 
XIX. Remarks on Professor Hansteen’s Account of a 
> Shooting Star, seen in the Day-time. By Mr 
Thomas Dick of Perth, - - 167 
XX. On the Value of Water as a Moving Power for Ma- 
chinery, illustrated in an Extract from a Report 
in regard to the Water of Leith, by Professors 
Leslie and Jameson, - - - 170 
XXI. Extract of a Letter from Dr Richardson, on the 
Progress of the Overland Arctic Expedition, to 
Professor Jameson, - - 173 
XXII. List of Rare Plants which have Flowered in the 
Royal Botanic Garden, Edinburgh, during the 
last three months. Communicated by Professor 
Graham, - - - 174 
XXIII. Celestial Phenomena from July 1. to October 1. 
1825, calculated for the Meridian of Edinburgh, 
Mean Time. By Mr George Innes, Aberdeen, 175 
XXIV. Meteorological Observations made at Leith. By 
Messrs Coldstream and Foggo, - 177 
XXV. Proceedings of the Wernerian Natural History 
Society. (Continued from Vol. XII. p. 402.), 181 
XXVI. The Northern Institution, - - 184 
XXVII. Scientific Intelligence. 
METEOROLOGY. , 
1. Hygrometer. 2. Meteoric appearance on Ben Lomond 
and Loch Lomond. 3. Largest Mass of European Me- 
teoric Iron. 4. Meteoric Olivine of the Pallas Meteoric 
Iron. 5. Meteoric Olivine of the Meteoric Iron of Olum- 
ba in South America. 6. Meteoric Olivine of the Me- 
teoric Iron of Grimma in Saxony, - 185-187 
hydrography. 
7 . Extraordinary Rise of the Rio de la Plata, - 187 
mineralogy. 
8. Resiniform Hydrate of Alumina. Q, Native Seleniuret of 
