572 
of some new minerals, 188; on the 
electrical origin of chemical heat, 204 ; 
on the biniodide of mercury, 209 ; com- 
position of paraffine, 235; analyses of 
human bones, 236; compounds of phos- 
phoric acid with lead, 237 ; new method 
of precipitating metals in the state of 
sulphurets, 237 ; on pyrogallic acid and 
astringent substances, 279, 417; new 
method of obtaining pure silver, 283 ; 
on the new method of estimating nitro- 
gen, 286, 317, 320; iodide of mercury, 
297; picrotoxine, 320; combinations 
of nitrogen with silicon, 321; remark- 
able formation of Prussian blue, 322; 
sugar from Zea Mays, 323; heat disen- 
gaged in combinations, 329; on metallic 
acids, 418, 496; action of muriatic acid 
on tannin, 422; electrolysis of salts, 
461; zthogen and ezthonides, 467; on 
manures, 470; manufacture of sulphu- 
ric acid from iron pyrites, 496; ami- 
dogen theory, 498. 
Chrysoberyl, composition of, 501. 
Chrysotype, description of the process, 
Circular parts, on the invention of, 350. 
Coal, on the theory of the origin of, 541. 
Coal-fields of Pennsylvania and Nova 
Scotia, on the, 66. 
Cockle (T.) on the solution of an equation, 
502. 
Colours, vegetable, action of the rays of 
the solar spectrum on, 5,107, 135, 170, 
246; on the Daguerreotype plate, 120. 
Colours in iridescent agate, on the cause - 
of the, 213. 
Comet, observations on the new, 323. 
Conie section, on the determination of the 
foci of a, 440. 
Corchorus Japonica, on the colour of, 16. 
Corona, on an easy method of imitating 
the, 569. 
Croft (H.) on the manufacture of sugar 
from Zea Mays, 323. 
Cyanotype, description of the process of, 
247. 
Daguerreotypes, on the art of multiplying, 
by the tithonotype, 365. 
Daniell (Prof.) on voltaic batteries, 32, 
133; Chemical Philosophy, reviewed, 
298; on the electrolysis of salts, 461 ; 
on the amidogen theory, 498. 
Davies (IT. S.) on the foci and directrices 
of the line of the second order, 25; on 
the determination of the foci of a conic 
section, 440. 
Dawes (Rev. W. R.) on the new comet, 
323. 
De Morgan (Prof.) on the invention of 
circular parts, 350. 
Dinornis, account of the, 558. 
INDEX. 
Divi-divi, chemical examination of, 425. 
Draper (Prof. J. W.) on the action of the 
rays of the solar spectrum on the Da- 
guerreotype plate, 120; on the deti- 
thonizing power of certain gases, and 
on an instantaneous means of producing 
spectral appearances, 161; on a new 
system of inactive tithonographic spaces 
in the solar spectrum, 360; on the ti- 
thonotype, or art of multiplying Da- 
guerreotypes, 365. 
Dufrenoy (M.) on a variety of arseniate 
of iron, 500. 
Dumas (M.) on the equivalents of certain 
bodies, 76. 
Earl of Munster, notice of the late, 150. 
Earnshaw (Rev. S.) on a new experiment 
in physical optics, 92; on the theory 
of the dispersion of light, 22, 116, 194; 
on a property of circularly polarized 
light, 262. 
Eclipse of the sun, of July 8, 1842, ob- 
servations on the, 386, 391. 
Egypt, on the geology of, 215. 
Electrical inductive action, on static, 200. 
Electrical origin of chemical heat, 204. 
Electrical Society of London, proceedings 
of the, 232, 412, 490. 
Electricity, efficacy of steam in the pro- 
duction of, 1, 570 ; experiments in, 208, 
265, 486 ; of high-pressure steam, 267. 
Electrolysis of salts, observations on the, 
461. 
Elephants, on some fossil remains of, 65. 
Elliptic functions, on Jacobi’s theory of, 
258, 358. 
Equations, new criteria for the imaginary 
roots of, 186, 252. 
Equivalents of certain elementary bodies, 
76. 
Erythrite, composition of, 188. 
Fahlerz containing mercury, analysis of, 
500. 
Faraday (M.) on static electrical inductive 
action, 200; on the chemical and con- 
tact theories of the voltaic battery, 268, 
477 ; experimental researches in elec- 
tricity, 456 ; on the electricity of steam, 
570. 
Fenwick (S.)° on Brianchon’s theorem, 
167. 
Ferrosesquicyanuret of potassium, effects 
of light on solutions of, 171. 
Fissiparous generation, on, 489. 
Fizeau (M.) on the formation of Moser’s 
images, 324. 
Flowers, on the colours of, under the ac- 
tion of the spectrum, 12. 
Fluid motion, rectilinear, on the analytical 
condition of, 55, 97. 
Foci and directrices of the line of the 
second order, remarks on the, 25. 
