INDEX 
TO THE 
PHILOSOPHICAL TRANSACTIONS 
FOR THE YEAR 1840. 
A. 
Actinograpli, description of an, 46. 
Airy (George Biddell, Esq.). On the theoretical explanation of an apparent new polarity of 
light, 225. 
Ammoniac resin, 350. 
Archil and litmus, contributions to the chemical history of, 273. Section I. Chemical exami- 
nation of the Roccella Tinctoria (archil-weed), 275 ; I. Of erythryline, 277 ; II. Of 
erythrine, 279 ; III. Of erythrine-bitter. — Amarythrine, 282 ; IY. Of telerythrine, 283. 
Section II. Chemical examination of archil (orseille) of commerce, 285 ; I. Of azoery- 
thrine, 287 ; II. Of orceine, 289 ; III. Of erythroleic acid, 295. Section III. Of litmus, 
298; I. Of erythrolein, 299; II. Of erythrolitmine, 301; III. Of azolitmine, 304; IV. 
Of Spaniolitmine, 307. Section IV. Of the decolorization of the bodies which exist in 
archil and litmus, 311 ; action of chlorine on azolitmine, 321 ; action of chlorine on ery- 
throlitmine, 322. 
Assafcetida, resin of, 354. 
B. 
Bakerian Lecture, 225. 
Barry (Martin, M.D.). Researches in Embryology. Third series : A contribution to the 
physiology of cells, 529. 
— On the corpuscles of the blood, 595. 
Bdellium, resin of, 368. 
Bell (Sir Charles). On the nervous system, 245. 
Benzoin, resin of, 369; action of caustic lime on, 372; action of caustic potash on, 375; action 
of oxide of lead on, 378; on the rational constitution of the, 380; general results in regard 
to the, 383, 
Berengela resin, 346. 
Blood, on the corpuscles of the, 595 ; progressive division of the blood-disc into globules, ibid . ; 
rapid and incessant changes in the form of altered blood-corpuscles, 598 ; the chorion formed 
of cells derived from corpuscles of the blood, 600 ; muscular fibre formed of cells derived 
from corpuscles of the blood, 601 ; state of the blood-corpuscles during vital turgescence of 
the vessels, 606 ; explanation of the plates, 609. 
Bowman (William, Esq.). On the minute structure and movements of voluntary muscle, 457. 
C. 
Calorific rays in the solar spectrum, on the distribution of the, 51. 
Calorific spectrum, account of a process for rendering it visible by its effect on paper properly 
prepared, and of some further results obtained respecting the distribution of heat therein, 52. 
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