668 INDEX. 
¥ 
Temperature and Density, on the quantities of mechanical energy contained in a fluid in different states 
as to, 475. 
Temperature in Liquid Water, on the dynamical equivalent of, and the specific heat of atmospheric 
air and steam, 191. 
Terror (Right Rev. Bishop). Summation of a compound series, and its application to a problem in 
probabilities, 541, 
Thermometer, on the absolute zero of the perfect gas, 561. 
Tuomson (Witutam). On the dynamical theory of “heat, with numerical resulis deduced from M. 
Joule’s equivalent of a thermal unit, and M. Regnault’s observations on steam, 261. On a 
method of discovering experimentally the relation between the mechanical work spent, and the 
heat produced by the compression of a gaseous fluid, 289. On the dynamical theory of heat. 
Part V. On the quantities of mechanical energy contained in a fluid in different states, as to 
temperature and density, 475. 
Tourmaline, Titanium, and Quartz, on the optical phenomena and crystallisation of, within mica, 
amethyst, and topaz, 547. 
Trait (Tuomas Stewart), M.D. Dissertation on a Peruvian musical instrument, like the syrinx of 
the ancients, 121. 
Vv 
Vital Afinity, defence of the doctrine of, 385. 
Vivarais (Ardéche), voleanic geology of the, 1. 
W 
Water, dynamical equivalent of temperature in liquid, and the specific heat of atmospheric air and 
steam, 191. On the computation of the specific heat of liquid water at various temperatures, 
from the experiments of M. Regnault, 441. 
Witson (Georce), M.D. On two new processes for the detection of fluorine when accompanied by . 
silica, and on the presence of fluorine in granite, trap, and other igneous rocks, and in the ashes 
of recent and fossil plants, 483, On nitric acid as a source of the nitrogen found in plants, 591. 
Wind, on a necessary correction to the observed height of the barometer depending upon the force 
of the, 377. 
Z 
Zodiacal Light, contributions to a knowledge of the phenomena of, 489. 
END OF VOLUME TWENTIETH. 
Neri & Co., Printers, Edinburgh. 




