INDEX. 
D 
Differential thermometer, new form of, p. 129. 
, some applications of, p. 180. 
Dispersive ratio of glass, method of determining, p. 285. 
F 
Foster, Lieut. 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. 281. 
Gum arabic, composition of, p. 884. 
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. 
Henderson, Thomas, Esq. on the difference of Meridians of the 
Royal Observatories of Green ich and Paris, p. 286. 
Hen-Pheasa Js, on the change ot plumage in, p. 268. 
Herschel, J. F. W. Esq. His correction of an error in a Paper 
published in the Philosophical Transactions, entitled f£ On the 
Parallax of the Fixed Stars,” p. 126. 
Home, Si r Everard, Bart. The C’roonian 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. 
