INDEX. 667 
M 
Marine Invertebrata new to the British Seas, on some remarkable, 307. 
Maxwett (James Crerx). On the equilibrium of elastic solids, 87. 
Mechanical Action of Heat, especially in gases and vapours, 147. 
Meconic Acid, and some of its derivatives, 401. 
Metaphysicians, speculations of Dr Brown and other recent, regarding the exercise of the senses, 513. 
N 
Nitric Acid, as a source of the nitrogen found in plants, 591. 
Nitrogen found in Plants, on nitric acid as a source of the, 591. 
O 
Opium, researches on some of the crystalline constituents of, 347. 
P 
Peruvian Musical Instrument, like the syrinx of the Ancients, dissertation on a, 121. 
Probabilities, summation of a compound series, and its application to a problem in, 541. 
R 
Ranxinz (W. J. Macauorn). On the mechanical action of heat, especially in gases and vapours, 147. 
Note as to the dynamical equivalent of temperature in liquid water, and the specific heat of 
atmospheric air and steam, 191. On the power and economy of single-acting expansive steam- 
engines, 195. On the economy. of heat in expansive machines, 205. On the centrifugal theory 
of elasticity, and its connection with the theory of heat, 425. On the computation of the 
specific heat of liquid water at various temperatures, from the experiments of M. Regnault, 441. 
On the absolute zero of the perfect gas thermometer; being a note to a paper on the mechanical 
action of heat, 561, 565. 
Rowney (Tuomas). Ona new source for obtaining capric acid, and remarks on some of its salts, 219. 
Ss 
Salmo umbla, some observations on the charr (Salmo umbla), relating chiefly to its generation and 
early stage of life, 321. 
Senses, observations on the speculations of Dr Brown, and other recent metaphysicians, regarding the 
exercise of the, 513. 
Single-Acting Expansive Steam-Engines, on the power and economy of, 195. 
Smyru (Cuares Prazz1). Some remarks on the theories of cometary physics, 131. Contributions 
to a knowledge of the phenomena of zodiacal light, 489. On the total solar eclipse of 1851, 
503. 
Solar (total) Eclipse of 1851, 503. 
Solids, on the equilibrium of elastic, 87. 
Steam Engines, on the power and economy of single-acting expansive, 195. 
Stoxss (Professor). On the total intensity of interfering light, 317. 
Sun, on the total eclipse of the, on July 28, 1851, observed at Goteborg, with a description of a new 
micrometer, 335. On the red prominences seen during total eclipses of the, 461. 
Swan (Witu1am). On the total eclipse of the sun, on July 28, 1851, observed at Goteborg, with a 
description of a new position micrometer, 335. On the red prominences seen during total 
eclipses of the sun, 461. 
