SUBJECT INDEX 



Aberration, 67, 125; in lenses, 72 

 Absolute Units, system of, 242 f. 

 Achromatic lenses, 200 

 Acids, organic vegetable, Scheele's 



work on, 142 

 Action and reaction, 87 

 Aerodynamics, 94 

 Air, liquefaction of, 306 f.; pressure 



of, 48 ff . 

 Air-pump, 56 



Alkali metals, discovery of, 190 

 Alkaline earth metals, discovery of, 



194 

 Alkalis, mild and caustic, 129 

 Ammonia, discovery of, 145 

 Anatomy, 308 

 Animal electricity, 165 

 Argon, 147 

 Astrology, 42 



Astronomy, early, 4; (Galileo), 30 f. 

 Atmosphere, temperature of 



(Carnot), 232; weight of, 59 

 Atomic theory (Dalton), 178 f. 

 Atoms, electrical forces in, 195; 



electrical theory of, 367 f., 378 

 Avogadro's law, 186, 301 



Ballistic galvanometer, 256 



Balloon, 11, 146 



Barium compounds, discovery of, 

 142 



Barometer, 48 ff.; aneroid, 118 



Benzine, discovery of, 251 



Bible, 5 



Biology, 308 



Biot-Savart law, 267 



Black body, radiation of, 354 



Blood, circulation of, 308 f.; cor- 

 puscles of, 310 



Boyle's Law, 301 



Bunsen burner, 326; element, 323 



Cacodyl, 335 

 Calorimeter, 1 27 



BBS 38s 



Camera obscura, 45 



Capacity, electrical (Weber), 263 



Capillaiity of liquids (Laplace), 



219 

 Carbon, compounds with chlorine 



of, 250 

 Carbon monoxide, discovery of, 



Carbonic acid, discovery of, 129, 



14s 

 Carnot's cycle, 233 

 Cathode rays, 230, 344 

 Cells, living, 310 

 Centre of gravity, principle of, 93 

 Centrifugal force, 79 

 Centripetal force, 89 

 Ceres (planet), 240 

 Cerium, discovery of, 181 

 Chemical energy, 276 

 Chemistry, 64 



Chlorine, Davy's work on, 191 

 Chlorine, discovery of, 142 

 Clock, 70 ff. 

 Collision, laws of, 78 

 Collision of elastic bodies, 78, 80 

 Colour, theory of, Goethe's, 



102 ff., Newton's, too 

 Combination, laws of chemical, 



177. 



Combining weights, 336 



Condenser, electrical, 156, 164; 

 steam. Watts, 132 



Conductors, electric, classes of, 165 



Coulomb's laws, 149 ff. 



Critical temperature, 303 



Crusades, 6 



Cups, Volta's, 164, 168 



Current, electric, Ampfere's con- 

 ception of, 226 



Cyanogen, 335 



Damped oscillations, 95 

 Decimal system, 23 

 Declination, magnetic, 153 



