614 INDEX. 
BAROMETER, on the diurnal variations of the. H. ; BREWSTER, LL.D. (DAVID), description of a new 
iv. 23. 
description of a, which marks the rise and 
fall of mercury from two different times of obser- 
vation. P. C. iv. 209. 
of the diurnal variations of the. H. v. 3. 
on the horary oscillations of the, near Edin- 
burgh. xii. 153. 
BAROMETRICAL MEASUREMENTS, on the causes 
which affect the accuracy of. P. C. i. 87. 
BASALTES of the coast of Antrim, remarks on the. 
H. v. 15. 
BEATTIE (DR JAMES), remarks on some passages 
of the sixth book of the Aineid. L. C. ii. 33. 
BELEMNITE, observations on the structure of the. 
ix. 893. 
BLACK (DR JOSEPH), an analysis of some hot 
springs in Ieeland. P. C. iii. 95. 
minutes of the life and character of. H. v. 
101. 
BLACKADDER (HENRY HOME), on the con- 
struction of meteorological instruments which de- 
termine the indications during absence. x. 337. 
description of a new register thermometer, 
without any index. x. 440. 
BLAIR, BART. (SIR JAMES HUNTER), biogra- 
phical account of. H. iii. 31. 
BLAIR (DR ROBERT), experiments and observations 
on the unequal refrangibility of light. P. C. ii. 3. 
BLANE (DRG.), account of a hurricane at Barba- 
does. H. i. 30. 
BLAST FURNACES, practical remarks on. vy. 31. 
BLENDE, on the composition of. xi. 332. 
BLIZARD (THOMAS), description of an extra- 
uterine fetus. v. 189. 
BONAR (JAMES), disquisitions on the origin and 
radical sense of the Greek prepositions. y. 805. 
BOY, some account of a, born blind and deaf. 
vii. 1. 
additional communications respecting. viii. 129. 
on his education, by Dr H. Dewar. viii. 137. 
BRAHMINS, remarks on the astronomy of the. P. C. 
ii. 185. 
observations on the trigonometrical tables of 
the. P.C. iy. 83. 
BRAMBLE, account of a variety of the. H. iil. 20. 
BRAIN, pathological observations on the. P.C. ii. 17. 
BRAZILIAN STONE, of the flexibility of the. P. C. 
iii. 86. 
BREWSTER, LL.D. (DAVID), demonstration of the 
fundamental property of the lever. vi. 397. 
on the optical properties of sulphate of car- 
bon, &e. vii. 285. 
on a new species of coloured fringes produced 
by the reflection of light between two plates of 
parallel glass of equal thickness. vii. 435. 
on the action of transparent bodies upon the 
differently coloured rays of light. viii. 1. 
darkening glass for solar observations. viii. 25. 
on the optical properties of muriate of soda, 
fluate of lime, and the diamond. viii. 157. 
on a new optical and mineralogical property 
of calcareous spar. viii. 165. 
on the effects of compression and dilatation in 
altering the polarizing structure of doubly refracting 
erystals. viii. 281. ‘ 
on the laws which regulate the distribution 
of the polarizing force in plates, tubes, and cylin- 
ders of glass. viii. 353. 
on circular polarization, as exhibited in the 
optical structure of the amethyst. ix. 139. 
observations on the mean temperature of the 
globe. ix. 201. 
account of the native hydrate of magnesia, 
discovered by Dr Hibbert in Shetland. ix. 289, 
account of a remarkable structure in apophyl- 
lite, with observations on the optical peculiarities 
of that mineral. ix. 817. 
description of a monochromatic lamp for mi- 
croscopical purposes, &c. ix. 433. 
on the existence of two new fluids in the 
cavities of minerals. x. 1. 
description of hopeite, a new mineral from 
Altenberg. x. 107. 
on a new species of double refraction accom- 
panying a remarkable structure in the mineral 
called Analcime. x. 187. 
- results of the thermometrical observations 
made at Leith Fort, every hour of the day and 
night, during the whole of the years 1824 and 1828. 
x. 362, 
on the refractive power, and other properties 
of the two new fluids in minerals. x. 407. 
on the construction of polyzonal lenses, and 
their combination with plain mirrors for the pur- 
poses of illumination in light-houses. xi. 33. 
account of a remarkable peculiarity in the 
structure of glauberite. xi. 273. 
on certain new phenomena of colour in La- 
brador felspar, with observations on the nature and 
cause of its changeable tints. xi. 322. 
on a new analysis of solar light indicating 
three primary colours, forming coincident spectra of 
equal length. xii. 123. 
ona new species of coloured fringes, produced 
from reflection between the lenses of achromatic 
compound object glasses. xii. 191. 
(now SIR DAVID), observations on the lines 
of the solar spectrum, and on those produced by 
the earth’s atmosphere, and by the action of nitrous 
acid gas. xii, 519. 
on the colours of natural bodies. xii. 538. 
BREWSTER (REV. JAMES), remarkable case of 
Margaret Lyall, who continued in a state of sleep 
nearly six weeks, viii. 249. 
