I 86 5 ] 
torrid zones, p. 742— >756. Remarks on the error of the rule in the tables of com- 
putation, and a method of bringing the theory of the barometer to greater perfection, 
p. 759 — 770. Precepts and tables for making the calculations, p. 571 — 591. 
Computations of barometrical obfervations made on various heights, p, 773 787. 
Anetnouies, See Sea anemmies. 
Angles, An account of a new infirument for meafuring fmall angles, called the prifmatic 
micrometer, p. 799. See Micrometer, 
Antelopes , an animal of that fort, frequently hunted in Africa, p.40 
Apparatus, Defcription of one for further illufirating the Franklinian theory of the 
Leyden bottle, p. 99, 100. A fimple ele&rical apparatus, by which almofi every 
article may be examined with the utmoft facility, p. 1 18. Obfervations and pre- 
cautions in the ufe of it, p.119, 120. The eleftricity of various fubilances dif- 
covered with it, p. 122 — 126. Remark on the rubbers ufed, p. 127 — 129. Appa- 
ratus for determining the annual evaporation in Liverpool, p. 245, 246. 
Apples . Method of raifing pine-apples in water, p. 649 — 6^2. 
Arabic . A tranfiation of a paifage in Ebn Younes ; with fome remarks thereon, p.23i« 
See Ebn Younes. 
Arcs, Computations of the lengths of circular arcs by means of infinite feriefes, derived 
from their tangents, p. 194 — 199. Computations of an arch of thirty degrees, 
p. 199 — 203. Computation of an arch of forty-five degrees, p. 203-— 214. Com- 
putation of the feries which exprefies the time of the defcent of a pendulum through 
the arch of a circle, p. 2 15 — 230. 
Articles (mathematical) leading to a clear and fatisfa&ory consideration of the motion 
of the earth’s axis, p. 267 — 288. How the joint centrifugal force of the particles of a 
fpheroid or cylinder, having a rotatory motion about any momentary axis, is com- 
puted, p. 289 — 295. 
Afronomy , the ancient Bramins had a knowledge of it, p. 598. 601 — 606. 
Atmofphere, obfervations on its ele&ricity, p. £o. A quantity of ele&ricity in the at- 
mofphere at all times, ibid. The eledlricity of the atmofphere, and of fogs of the 
fame kind, ibid. Evaporation confidered as a tefi of the moifiure or drynefs of the 
atmofphere, p. 244. See Evaporation, Atmofphere of Peru confiantly obfcured 
-with vapours during part of the year, and the whole country involved in thick fogs, 
p. 257, 258. Depth of rain not a true index of the moifiure or drynefs of the atmof- 
phere, p. 250 — 252. Why much rain gives no more moifiure to it than a little, 
p. 251, Atmofphere amazingly clear in the Eaft Indies, p. 604. 
Atmofpherical ele6lrometer , defcription and ufe of one, p. 48, 49. 
Aubert , ( Alexander , Efq;) his attefiation concerning Dr. Malkelyne’s invention of the 
pi ifmaric micrometer, p. 8 i£. 
Axis, the earth’s, mathematical articles leading to a clear and fatisfa&ory confideration 
of its motion, p. 267 — 288. How the joint centrifugal force of the particles of a 
Vol. LX VII. 5 fpheroid 
