INDEX. 
Fibrine, preparation and composition 
of, 248, 
Fizeau, M., on the causes which con- 
cur in the production of the images 
of Moser, 488. 
Fluids, on the cohesion of, 564. 
Fluoride of cacodyl, 305. 
Forces, attractive and repulsive, on 
_- some general propositions relating 
to, 153. 
Gauss, C. F., on a method of facilita- 
ting the observations of deflection, 
145; on general propositions re- 
lating to attractive and repulsive 
forces acting in the inverse ratio of 
the square cf the distance, 153; 
dioptric researches, abstract of 
some of the principal, propositions of, 
490; observations of the magnetic 
inclination at Gottingen, 623. 
Gluten, on the nature and composition 
of, 254. 
Grasses, on the formation of the em- 
bryo in the, 12. 
Haloid compounds of cacody], on the, 
295. 
Hansen, M., on a method for compu- 
ting the absolute disturbances of the 
heavenly bodies, 587. 
Heat, on laws of the transmission of, 
528. 
Heavenly bodies, on a method for 
computing the absolute disturbances 
of the, 587. 
Hyponitric acid, action of sulphurous 
acid on, 65. 
Induetion-inclinometer of Dr. Lloyd, 
remarks on, 612. 
Infusoria, on the long duration of life 
of the, 326. 
Infusorial animalcules of the chalk, 
. descriptions of some new, 346, 
Intensity, diurnal movement of the 
horizontal, 605; observations on 
Dr. Lloyd’s method of determining 
the absolute horizontal, 615. 
Todide of cacodyl, 303. 
Isothermal lines, on the form of the, 
235. 
Lamont, Dr. J., on the magnetic ob- 
servatory and instruments at Mu- 
nich, 499; results of magnetic ob- 
servations in Munich during 1840, 
1841 and 1842, 603; on Dr. Lloyd’s 
induction-inclinometer, 612; on 
Dr. Lloyd’s method of determining 
the absolute horizontalintensity,615, 
733 
Liebig, Prof., on the azotized nutri- 
tive principles of plants, 244. 
Light, on the theory of, 264; on the 
action of, on all bodies, 422; on 
the chemical action of, 537, 558; 
on the theory of emission of, 559 ; 
on the power it possesses of becom- 
ing latent, 465. 
, invisible, some remarks on, 461. 
, latent, on the colour of, 469. 
Lloyd’s, Dr., induction-inclinometer, 
remarks on, 612; method of deter- 
mining the absolute horizontal in- 
tensity, remarks on, 615. 
Magnet, deflection of the, caused by 
alteration of temperature, 510. 
Magnetic observations on the Hohen- 
peissenberg, account of some, 525 ; 
made in Munich during 1841, 1842 
and 1843, results of the, 603. 
Magnetic inclination at Gottingen, ob- 
servations of the. 623. 
Magnetical observations, instructions 
for making, 145. 
Margaric acid, on the production of, 
57. 
Margarone, composition of, 58. 
Melloni, M., on the cause of the dif- 
ferences observed in the absorbing 
powers of polished and striated me- 
tallic plates, 416 ; on a new nomen- 
clature for the science of calorific 
vadiations, 527. 
Menabrea, L. F., on the analytical en- 
gine invented by C. Babbage, 666. 
Mercury, compound of the chloride 
of, with oxide of cacodyl, 307; on 
the colour of the latent light of the 
vapours of, 482, 
Metallic plates, polished and striated, 
on the cause of the differences in 
the absorbing powers of, 416. 
Meyen, Dr. F. J. F., on the act of 
impregnation and on polyembryony 
in the higher plants, 1. 
Mirbel and Spach, MM., on the forma- 
tion of the embryo in the grasses, 12. 
Molecular forces producing capillary 
phzenomena, on the action of the, 
564. 
Moser, L., on vision, and the action 
of light on all bodies, 422; on in- 
visible light, 461; on the power 
which light possesses of becoming 
latent, 465. 
Moser’s images, on the causes which 
concur in the production of, 488, 
