GENERAL INDEX. 



Boat, action of the oar in rowing .... POT-. INT. 



Bodies, their general properties explained . . . 



their impenetrability illustrated . . . 



. . extension and figure, or shape . . . 



. . divisibility, examples of . ' . . 



. . inertia denned and illustrated . . . 



. . attraction of ...... 



. . density and rarity of explained .... 



. . falling, resistance of the air to . . . 



. . experiments on ....... 



. . moving, general effect on the resistance of the air to 



. . their elasticity illustrated .... 



. . centre of gravity of, defined and illustrated . . . 



. . their weight different at different parts of the earth's 



surface ........ 



. . momentum of, denned and illustrated . . . 



. . in motion, measure of the resistance of the air to . 



. . specific gravity of explained .... 



. . their sonorousness owing to their elasticity . 



. . at what degree of velocity their motion ceases to be 



apparent ........ 



. . heavenly, why their apparent situation differs from 



the real ........ 



. . various, tables of their expansion, by heat . . THERM. 



. . what shape of, is most favourable for retaining elec- ELECT. 

 tricity ........ 



. . effects of electricity upon different 



. . pointed, phenomena of entrance or issue of electricity in 



. . mechanical effects of electricity upon 



. . not ferruginous, on the magnetism of 



. . of all kinds are, more or less, susceptible of magnetism 



. . become more obscure by excess of light 



. . reflect, more copiously, rays of their own colour . 



.. magnitude of their corpuscles investigated . . 



. . colour or opacity of depends on their pores . 



light not reflected from their solid surfaces . . 



Boiling point of water affected by atmospheric pressure . THERM. . 

 table of its height in different states of 



the barometer ....... 



Books upon optics and optical instruments", list of . OPT. INST. 



Bores, elliptical, of thermometer tubes, their use . . THERM. . 



BOYLE'S thermometer described .... 



proposed scales for thermometers . . . . 



Brass has sometimes a considerable magnetic power . MAGN. 



Breezes, sea and land, accounted for . . . Poi>. INT. 



BREGUET'S pyrometer described .... THERM. 



BREWSTER'S improvements of lenses . . . OPT. INST. 



. . lenses built of circular rings . . . 



kaleidoscope, construction of . . . 



compound microscope for objects of Natural 



History ......... 



reflecting telescope described . . . 



telescope for measuring distances described . 



BUFFON, his burning mirrors described . . . 



Bulk, apparent, of images accounted for ... 



Burning-glasses described by Aristophanes . . . NK\V. OPT. 

 lens, Parker's large one described . OPT. INST. 



mirror of Archimedes ..... 



of Buffon and Villette with their experi- 

 ments ........ 



Calcareous spar, experiments on . . 

 Calorimeter, description and use of . 



Hare's described 



Camera lucida, description of . . 



Camera obscura, accounts of the invention of 

 CANTON'S method of making artificial magnets 



NEW. OPT. 

 . THERM. . 



GALV. 



. OPT. INST. 

 NEW. OPT. 3. OPT. INST. 



MAGN. 



19 



Page 



. 13 



. 18 



1 



2 



2 



3 



. 3,4 

 4 

 7 



8,10 



. 17, 18 



1113 



9, 1820 



43 



. 11 



. 17,18 



59,60 



71 



. 80 



87 

 . 61,62 



7 



4151 

 27 



. 42 45 



8991 



90 



. 10 



37 



55 



. 53 



. 55 



8 



. 15 



60 



11 



3,4 



4 



90 



70, 71 

 32, 33 

 . 40 

 78 

 . 55 



47 

 16 



. 25 

 3 

 2 

 2 

 7 

 1 



. 9 

 52,53 



. 4 



53,54 



52 



Caoutchouc, (India rubber) its use in making thread for 

 microscopes 



OPT. INST, 



