CONTENTS 
OF 
No. XXVII. 
Pag© 
Art. L On the Construction of Achromatic Object-Glasses. 
By Peter Barlow, Esq. F. R.S. Professor in the 
Royal Military Academy, Woolwich, - 1 
II. General Reflections on various important subjects in 
Mineralogy. By Frederick Mohs, Esq. Knight of 
the Order of Civil Merit, Professor of Mineralogy 
at Freyberg, Fellow of the Royal Society of Edin- 
burgh, of the Wernerian Natural History Society, 
&c. (Continued from Vol. XIII. p. 218.) - 18 
III. A Description of an Improvement on Bramah’s Hy- 
dro-mechanical Press, with its application to Oil 
Mills. By John Tredgold, Esq. Civil Engineer, 
and Honorary Member of the Institution of Civil 
Engineers, London, - 29 
IV. On the Geographical Distribution of Palms (Palmae). 
By Prof. Schouw. (Continued from Vol. XII. p. 1 37-) 34 
V. Observations on the Temperature of Man and other 
Animals. By John Davy, M.D. F.R.S. (Con- 
cluded from Vol. XIII. p. 311.) 
III. On the Temperature of different kinds of Animals, 38 
VI. Chart of the Island of Ascension, with Remarks on its 
Geognosy. (Plate III.) By Captain Robert Camp- 
bell, R.N. Communicated by the Author, - 47 
VII. A Catalogue, in Right Ascension, of 46 principal Stars, 
deduced from Observations made at the Observa- 
tory of Trinity College, Dublin, in the years 1823 
and 1824. By the Rev. Dr Brinkley, - 50 
VIII. Account of a Bridge of Suspension made of Hide 
Ropes, in Chili. By Captain Basil Hall, F.R.S. 52 
IX. Observations for determining the Magnetic Variation, 
made in the Neighbourhood of Spitzbergen, by Capt. 
(then Lieut.) Franklin, assisted by Lieut. Beechy, 
Mr Back, and Mr Fyffe, in His Majesty’s Ship Trent, 
in the year 1818. Communicated by Capt. Franklin, 56 
