20 



GENERAL INDEX. 



POP. INT. 

 NEW. OPT. 

 OPT. INST. 

 NEW. OPT. 

 MAGN. 

 NEW. OPT. 

 ELECT. 



Capillary tubes, cause of the ascent of fluids in - 

 Cartesian ovals, account of ..... 



Cassegrainean telescope, description of .... 

 Cause of opacity in bodies, investigated 



. . of magnetic attraction, opinions on ... 



meaning of the word in Natural Philosophy 

 CAV ALLOTS electroscope described .... 



CAVENDISH, his improvements on Franklin's theory of 



electricity ........ 



. . his register thermometer described . THERM. . 



CELSIUS'S thermometer described ... 



Reaumur's and Fahrenheit's scales respectively 



converted into one another ..... . 



Centering of lenses, directions for ... OPT. INST. 



Centigrade (Celsius's) thermometer .... THERM. 



Centre of gravity of bodies explained and illustrated . POP. INT. 



Centrifugal force, explanation of .... 



Centripetal force, explanation of . ... 



Charcoal, splendid exhibition of electric light from . . GALV. . 



galvanic ignition of, at the Royal Institution, 



described ........ , 



Chemical effects of electricity, experiments on 



and electrical action, connexion between 



changes effected by galvanism 



effects of galvanism exemplified in the case of cop- 



pei and zinc . . . . . . . . 



theory of galvanism ..... . 



properties of elastic fluids differ with their species POP. INT. . 

 changes in the materials not the cause of thermo- 

 electricity ELECT. MAGN. 



CHILDREN'S galvanic battery, construction of . . GALV. 



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



Chromatic dispersion illustrated ..... OPT. INST. 



Chronometers disturbed by the local attraction of vessels . MAGN. 



Circles, galvanic, simple, formation of . . . . GALV. 



compound ... . . . . 



Circuit of electricity, meaning of the term . . . ELECT. 



Circular conductors, exhibition of their magnetic properties ELECT. MAGN. 



rings formed into lenses . . OPT. INST. 



CLAIRAULT'S aplanatic telescope described . . . 



Cobwebs, artificial, their use in microscopes . . . NEW. OPT. . 



Cohesion, attraction of, defined and illustrated . . POP. INT. 



Cold, however intense, does not impair magnetism . . MAGN. 



Coloured rings, phenomena of ..... NEW. OPT. 



. . reflected from coloured plates, table of . 



. . shadows, account and explanation of . . 



. . . . hyperbolic curves .... 



Colourless topaz of New Zealand used for prisms . . OPT. INST. 



Colours, Newton's theory of . . . . . . NEW. OPT. , 



mixture of ....... 



. . spectral, re-composition of .... 



of transparent liquors vary with their thickness 



reflected, Newton's scale for determining . 



reflected and transmitted by thick transparent plates 



. . of natural bodies, cause of investigated . . 



of thin plates of air, water, and glass, tables of . 



. . prismatic, obtained from voltaic light . . GALA'. 



. . . . their arrangement . . . POP. INT. . 



exist originally in the light . . 



reflected, theory of ..... . 



produced by the combustion of different metals . GALV. 



of electrical light, various exhibitions of . . ELECT. 

 Combination of lenses, and their magnifying power, known to 



Friar Bacon ........ NEW. OPT. 



Combination of sulphur and silver promoted by galvanism GALV. . 



Combustion of mercury, beautiful phenomena of . . 



Comets, observations on ...... POP. INT. 



Communication of the electric shock, extraordinary examples 



of .... . ELJECT. 



Page 

 5 

 8 



. 17 



53, 54 



33 



. 44 

 3 



12 

 . 34, 35 



. 8 



10 



. 31 

 9 



9,1820 



. 16,31 



16,31 



10 



10, 11 



. 47, 48 



57,58 



13 



14 



20 

 . 65 



. 95 

 8 



92 

 14 



. 68 



24 



49 



37 



34 



7,8 



20 



. 41 



3,4 



13 



. 41 

 52 



. 61 

 62 

 25 

 . 33 

 33 

 35 



. 37 

 46 



. 56 

 54 



. 52 

 .11 



. 91 

 90 



. 92 



13 



. 24 



. 3 



24 



13 



. 36, 37 



39, 40 



