INDEX. 
843 
Registration, automatic, of magnetometers and meteorological instruments by photography, 83. 
Reptile, fossil (Pelorosaurus), description of, 379. 
Retina and optic nerve, on the development of, 1 89. 
Rodentia, on the dental tissues of the Order, 529. 
Rolling of ships, on the, 611. 
Rosse (The Earl of). Observations on the Nebulas, 499. 
Royal Society, on the thermometrical observations taken at the Apartments of, 569. Comparison 
of the temperature at, with that of Greenwich, 579. 
S. 
Sabine (Lieut.-Col. R.A.). On the means adopted in the British Colonial Magnetic Observatories 
for determining the Absolute Values, Secular Change, and Annual Variation of the Magnetic- 
Force, 201. 
Salts, double, diffusion of, 21. 
Salts, various, diffusion of, 8. 
Sciurus niger, on the dental structures in, 535. 
Sea-sickness, on its effect on the temperature of the body, 445. 
Separation of salts by diffusion, 16. 
Ship-building, conclusions applicable to, from experiments and considerations on the dynamical 
stability, and on the oscillations of floating bodies, 632. 
Ships, on the rolling of, 611 ; on the dynamic stability of, 612. 
Soda, salts of, diffusion of, 40. 
Spalax typhlus, on the dental structures in, 541 . 
Stenhouse (Dr. John). On the Nitrogenated Principles of Vegetables as the Sources of Arti- 
ficial Alkaloids, 47. 
. On the Oils produced by the Action of Sulphuric Acid upon various 
Classes of Vegetables, 467. 
Sulphuric acid, on the oils produced by the action of, upon various classes of vegetables, ibid. 
Sykes (Lieut.-Col. W. H.). Discussion of Meteorological Observations taken in India, at various 
heights, embracing those at Dodabetta, on the Neelgherry Mountains, at 8640 feet above the 
level of the Sea, 297. 
T. 
Tadpole of the Triton and the Frog, on the influence of physical agents on the development of, 
431 ; of the Triton, ibid,-, of the Frog, 432. On the influence of atmospheric air, ibid,-, of 
food, 433 ; of temperature, 434 ; of light, 435. 
Tamias Lysteri, on the dental structures in, 538. 
Teeth, a system of notation for, in the Class Mammalia, 481. 
Teeth, molar, in the Wart-Hogs {Phacochoerus), on the development and homologies of, 481. 
Temperature of India, observations on, 323-335. 
Temperature of Man within the Tropics, on the, 437 ; variation of, during the twenty-four 
hours, ibid.-, during different seasons of the year, 439; of the effect of active exercise and 
of rest after exercise, 440 ; of the effect of carriage exercise and of gentle walking exercise, 
441 ; of the effect of change of temperature of the atmosphere, 442 ; of the effect of excited 
