INDEX. 



page 



Crystals^ on the elementary particles of certain, - 51 



— on the existence of two dispersive powers in all 



doubly refracting, - - - ^ I07 



Cube, origin of its form in crystallography, - - 59 



D 



Davy, Sir Humphry, LL D. On a new detonating com- 

 pound, - - - - - 1 



Some further obbervations 



on a new detonating substance, - - S42 



His experiments and obser- 



vations on the substances produced in differ-ent cheniical 

 processes on fluor spar, - - - 363 



Diamond, on substances which possess a higher refractive 

 power, - - - - 106 



E 



Elephant^ organic remains of that animal found near Brentford, 

 Middlesex, - - - - 134 



/'a/, on its formation in the intestines of living animals, - I46 



Fluor spar, some experiments and observations on the sub- 

 stances produced in different chemical processes on it, - 263 



Fluoric combinations, the different hypotheses which may be 

 formed on their nature, - - - 267 



■ principle, various attempts to procure it in a pure 



form - - . _ - 275 



Fluoric compounds, a peculiar substance exists in them, which 

 it is difficult to examine in a pure form, - 278 



Fluorine, a name given to a peculiar substance existing in 

 fluoric compounds, - - - 278 



Freezing at a distance, on a method of, - - Ti 



Gas, silicated fluoric acid, discovered by Scheele, descrip- 

 tion of it, - - - - - 265 



fluo-boric acid, discovered by Gay Lussac and The- 



NARD, description of it, - - - 266 



Glands, bronchial, on the black colouring matter of them, - 159 



■ — gastric, experiments to ascertain the coagulating power 

 of their secretion, - ^ - - - 96 



