11 
CONTENTS. 
Art. X. Account of the Bones of various Animals discovered 
at Breingues, in the Department du Lot. By. M. 
Delpon, - - - 300 
XI. Observations regarding the Position of the fossil Me- 
galosaurus and Didelphis or Opossum at Stones- 
field, - - 303 
XII. Observations on the Comet of July 1825. By Pro- 
fessor Gautier, - - 304 
XIII. On the Practical Construction of Achromatic Object- 
Glasses. By Peter Barlow, Esq. F.K.S. Profes- 
sor in the Royal Military Academy, Woolwich. 
Communicated by the Author. (Concluded from 
p. 18.) - 311 
XIV. Notices regarding the Vineyards of Egypt, - 322 
XV. Account of a newly invented and rotatory Gas- 
Burner. By Mr James Nimmo, Edinburgh, 325 
XVI. Notice regarding the Phosphate of Lime of the Coal 
Formation. By M. P. Berthier, - 326 
XVII. Observations made for Determining the Progress of 
the Horary Variations of the Barometer under the 
Tropics, from the Level of the Sea to the Ridge of 
the Cordillera of the Andes. By M. De Humboldt, 328 
XVIII. Experiments on the Action of Water upon Glass, 
with some Observations on its slow Decomposition. 
By Mr T. Griffiths, Chemical Assistant in the 
Royal Institution, - - - 331 
XIX. Observations and Experiments on the Structure and 
Functions of the Sponge. By Robert E. Grant, 
M.D. F.R.S.E. F.L.S. M.W.S. &c. (Continued 
from p. 124.) - - - 336 
XX. A concise statement of the Magnetical and other Phi- 
losophical Experiments and Observations made 
during the recent Northern Expedition under Cap- 
tains Parry and Hopner, 1824-5. By a Correspon- 
dent, - - 341 
XXI. Meteorological Observations made at Leith. By 
Messrs Coldstream and Foggo, - 346 
XXII. Celestial Phenomena from April 1. to July 1. 1826, 
calculated for the Meridian of Edinburgh, Mean 
Time. By Mr George Innes, Aberdeen, 351 
XXIII. List of Rare Plants which have Flowered in the 
Royal Botanic Garden, Edinburgh, during the last 
three months. Communicated by Prof, Graham, 351 
