GENERAL INDEX. 



Air, its resistance to moving bodies proportionate to the 



squares of their velocities ..... POP. INT. . 



.. its tremulous motion the cause of sound . . . - . 



. . means of weighing a small quantity of . . . - 



Air-pump, experiments with, described .... - 



Air-pyrometer, of Schmitz, construction of . . . THERM. . 



Air-thermometer, Kinnersley's Electrical, described . . ELECT. . 



Air, currents of, alway accompany the discharge of electricity - . 

 Alcoholic and mercurial thermometers, comparative table of 



at different temperatures ..... THERM. . 



Alkalis, decomposed by the voltaic pile .... GALV. . 



Amalgams for the rubbers of electrical machines . . ELECT. . 



Amician reflecting telescopes described .... OPT. INST. " 



AM AX TON'S thermometer, description of ... THERM. . 



objections to . . . . - 



AJIPERE'S electro-dynamic theory .... ELECT. MAGN. 



Analogy between the electric spark and lightning . . ELECT. . 



Anamorphoses restored by reflection from cylindrical surfaces OPT. INST. 



Anatomical description of the torpedo .... GALV. . 



Anatomy of the eye explained ... ... POP. INT. 



Ancients had no instruments for measuring heat . . THERM. . 



their opinions respecting the cause of magnetic at- 



traction ......... MAGN. . 



Angle, the smallest under which an object is visible . . POP. INT. . 



Angles of incidence and reflexion, equality of, known to Plato NEW. OPT. 

 . . . . known with precision by 



Ptolemy ......... -- 



particular explanation of OPT. INST. . 



defined . . . POP. INT. . 



. . account of telescopes for measuring . . . OPT. INST. 



Animal life equally destroyed by shocks from the electric or 



the voltaic battery ...... GALV. . 



Animals, dead, excited into convulsive muscular action by 



galvanism ......... - . 



warm-blooded and cold-blooded, galvanic effects of 



the contact of parts of one class with those of the other - . 



experiments of the effects of electricity upon . ELECT. 



Annual motion of the earth explained . . . POP. INT. 



Antimony and bismuth, the metals best fitted for producing 



thermo-electric currents ...... ELECT. MAG. 



Aplanatic diamond lenses, Pritchard's .... OPT. INST. 



telescopes, Clairault's and Herschel's, described - 



table for object-glasses of .' . . -- 



Apparatus for producing electro-magnetic rotations . * ELECT. MAGN. 



Apparent place and size of the image in plain mirrors . . OPT. INST. 



dimensions of objects of sight .... POP. INT. 



velocity of bodies, limit of . . . . . - . 



situation of the heavenly bodies . . . - 



ARAGO'S experiments on the magnetism of rotation . . MAGN. . 



ARCHIMEDES' burning mirrors, account of . . . NEW. OPT. 



ARISTOPHANES, his description of burning glasses . . - 

 ARISTOTLE attempted to investigate the phenomena of the 



rainbow ........ - 



Armatures for retaining and concentrating magnetism . MAGN. . 



Arrangement of iron filings under magnetic influence . - 



mechanical, of microscopes .... OPT. INST. 



of the prismatic colours exhibited . . POP. INT. 



Artificial cobwebs for micrometers ..... OPT, INST. . 



magnets, various methods of making . . MAGN. . 



general principles of . . . - 



method of making by percussion . - . 



juxtaposition . - 



single touch . - > . 

 less retentive of their virtues than load- 

 stones 



ready method of forming . . . . . 



Ascent of fluids in capillary tubes, cause of, explained . . POP. INT. 



. . of smoke, steam, &c., cause of . . . . - 



of balloons ........ __ 



17 

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43 



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