Index. 299 



Flame, account of, ii. 199, 200. 



Flash of electricity, effect of, on metals, ii. 1 12. 



Flint. See Silica. 



Fluoric acid, nature and properties of, ii. 160, l6l. 



Fluidity, one of the most general effects of heat, ii. 66 

 earths and stones of all kinds might probably be ren- 

 dered fluid by the same means, 67. 85 list of the 

 melting points of different substances, 68 fluidity does 

 not depend on the sensible, but the latent heat of bodies, 

 69. 74. 



Fluids, first principle, with respect to the pressure of, i. 

 36 how constituted, 38 density of, how put to the 

 test, 45 relative weight of, how ascertained, 46 

 canon of chemistry concerning the constitution of, ii. 

 38. See Hydrostatics, Hydraulics, and Pneumatics. 



Focus, (of burning glasses, &c.) explained, i. 144. 155. 

 162. 



Forcing pump, plan of the, i. 57 water raised to any 

 height by, 59. 



Fountains, phenomenon of boiling, i. 5 beautiful ex- 

 periment of an artificial, 75. 



Freezing, powerful effects of, in causing water to swell, 

 ii. 70, 71 reason why deep lakes do not freeze, 64 

 explanation, how the process of, is so slowly per- 

 formed, 70, 71 experiment in freezing water, from 

 which the air had been extracted, 72 agitation greatly 

 assists the operation of frost, ib. 



Friction, a method of producing heat, ii. 112. 



Frost, effect of, in fertilizing the earth, ii. 5Q. 



Fuel considered in its different varieties, as a means of 

 producing heat for chemical purposes, ii. 114. 116. 



Fusion, what so called, ii. 68 form and composition of 

 vessels used in the process of, 107, 108. 



Furnaces, construction of, for different chemical purposes, 

 ii. 1 17. 123. 



G. 



Gallic acid, nature of, ii. 166. 



Galvanism, account of the science of, i. 120 its dis- 

 covery, ib. method of making experiments in, 121 

 different experiments, 122. 124. 128 description of 

 galvanic batteries, 125 galvanism and electricity are 

 essentially the same, 127 applied to chemical purposes, 

 ii. 112. 



