622 INDEX. 
NAPIER (MACVEY), remarks illustrative of the 
scope and influence of the philosophical writings of 
Lord Bacon. viii. 873. 
NATURAL BODIES, on the colour of. xii. 538. 
NECKER (L. A.), honorary professor of mineralogy, 
Geneva, on the determination of the position of 
Strata in stratified rocks. xii. 863. 
NEILL, LL.D. (PATRICK), notice respecting a re- 
markable shower of hail, which fell in Orkney the 
24th July 1818. ix, 187. 
NICE, sketch of the geology of the environs of, 
viii. 427. 
NOUNS and ADJECTIVES, on the force of the 
Latin prefix ve or ve, inthe composition of. xiii. 63. 
OBELISK, account of the erection of a granite obe- 
lisk of a single stone, about seventy feet high, at 
Seringapatam. ix. 807. 
OBSERVATORY, notice of a new observatory at 
Aberdeen. H. iy. 19. 
OLDENLANDIA UMBELLATA, method of culti- 
vating the. H. iii. 16. 
OPIUM, experiments on the effects of. H. iy. 18. 
OTTER OF ROSES, method of making the, as it is 
prepared in the East Indies. P. C, ii. 12. 
PANTOGRAPH, account of the invention of the. 
xiii. 418, 
PEAT-MOSSES, account of the, of Kincardine and 
Flanders, in Perthshire. P. C. iii, 266. 
PENDULUMS, researches on the vibrations of, in 
fluid media. xiii. 54. 
PERTH, concerning the Chartreuse of. H. v. 25. 
PETROLEUM OF RANGOON, chemical examina- 
tion of the, xiii, 118. 
on the composition of the, with remarks on 
petroleum and naphtha in general, xiii. 124. 
PHOLAS, observations on two species of, found on 
the sea coast in the neighbourhood of Edinburgh. 
x. 428. 
, PHOTOMETER, on anew, founded on the principles 
of Bouguer. x. 443. 
PITCAITHLY, analysis of the mineral waters of. 
vii. 445. 
PLAYFAIR (PROFESSOR JOHN), on the causes 
which affect the accuracy of barometrical measure- 
ments. P. C, i, 87. 
remarks on the astronomy of the Brahmins. 
P. C. ii. 135. 
observations on the trigonometrical tables of 
the Brahmins. P. C. iv. 83. 
on the origin and investigation of porisms, 
P. C, iii. 154. 
investigation of theorems relating to the figure 
of the earth. vy. 3. 
of the diurnal variations of the barometer. 
H. ve3. 
phenomenon of two rainbows intersecting one 
another. H. vy. 8. 
PLAYFAIR (PROFESSOR JOHN), biographical 
account of Dr James Hutton. H. y. 80, 
of the solids of greatest attraction. vi. 187. 
on the progress of heat, when communicated 
to spherical bodies from their centres. yi. 853. 
—— account of the structure of table mountains, 
and other parts of the peninsula of the Cape. 
viii. 269, 
biographical account of the late John Robison, 
LL.D., &e. vii. 495. 
memoir relating to the naval tacties of the late 
John Clerk of Eldin. ix. 113, 
POLARIZATION, on circular, as exhibited in the 
optical structure of the amethyst. ix. 189. 
POLYZONAL LENSES, on the construction of, and 
their combination with plain mirrors, for the pur- 
poses of illumination in lighthouses. xi. 33. 
PORISMS, on the origin and investigation of. P. C. 
iy. 107. 
some geometrical, with examples of their ap- 
plication to the solution of problems. P. C. iv. 107. 
PREPOSITIONS, disquisitions on the origin and ra- 
dical sense of the Greek prepositions. v. 305. 
PRESSURES, elementary demonstrations of the com- 
position of. viii. 245. 
PRINCE OF WALES ISLAND, account of the. 
H. iii. 13. 
PROBLEMS, on the resolution of indeterminate. P. C. 
ii. 193. 
QUASSIA POLYGAMA, account of the. P. C. 
iii. 205. 
QUASSIA SIMARUBA, botanical and medical ac- 
count of the. P, C. ii. 73. 
RAIN, on the theory of. P. C. i. 41, 
answers to the objections of M. de Luc, with 
regard to the theory of rain. P. C, ii. 39. 
RAINBOWS, phenomenon of two, intersecting one 
another. H. v. 8. 
RAREFACTION, account of a very extraordinary 
effect of. vi. 245, 
REFRACTION, description of some remarkable ef- 
fects of unequal, observed at Bridlington Quay in 
the summer of 1826, xi. 8, 
RICHARDSON (REV. DR WILLIAM), on the 
dramatic or ancient form of historical composition. 
L. C. i. 99. 
remarks on the basalts of the coast of An- 
trim. H. vy. 16. 
RITCHIE A.M. (WILLIAM), on a new photome- 
ter, founded on the principles of Bouguer. x. 443. 
ROBERTSON (REV. THOMAS), an essay on the 
character of Hamlet. L. C. ii. 251. 
ROBISON LL.D. (JOHN), (Professor of Natural 
Philosophy in the University of Edinburgh), the or- 
bit and motion of the Georgium Sidus, determined 
directly from observations. P. C. i. 805. 
