INDEX. 
D 
Differential thermometer, new form of, p. 129. 
-, some applications of, p. 130. 
Dispersive ratio of glass, method of determining, p. 235. 
F 
Foster, Lient. Henry, R., N. His corrections to the reductions of 
Lieutenant Foster’s Observations on Atmospherical Refractions 
at Port Bowen; with addenda to the Table of Magnetic Intensities 
at the same place, p. 122. 
Fresh-water muscle, on the mode of breeding in, p. 44. 
G 
Gilbert, Davies, Esq. On the expediency of assigning specific 
names to all such functions of simple elements as represent 
definite physical properties ; with the suggestion of a new term 
in mechanics ; illustrated by an investigation of the machine 
moved by recoil ; and also by some observations on the Steam 
Engine, p. 25. 
Glass, dispersive ratio of, rules and principles for determining ; and 
for computing the radii of curvature for achromatic object-glasses, 
submitted to the test of experiment, p. 231. 
Gum arabic, composition of, p. 384. 
H 
Harwood, J. , M. D. On a newly discovered Genus of Serpentiform 
Fishes, p. 49. 
Harris, Mr. Wm. Snow. On the relative powers of various metallic 
substances as conductors of electricity, p, 18. 
H enderson, Thomas, Esq. on the difference of Meridians of the 
Royal Observatories of Green ich and Paris, p. 286. 
Hen-Pheasants, on the change of plumage in, p. 268. 
Herschel, J. F. W. Esq. His correction of an error in a Paper 
published in the Philosophical Transactions, entitled “ On the 
Parallax of the Fixed Stars,” p. 126. 
Home, Sir Everard, Bart. The Croonian Lecture, on the propaga¬ 
tion of the common oyster, and the large fresh-water muscle, 
p. 39. 
-. An examination into the structure of 
the cells of the human lungs ; with a view to ascertain the office 
they perform in respiration, p. 58. 
