INDEX. 
P a gr 
Priestly, Dr. liis experiments on the production of nitro- 
gene, during the freezing of water, noticed, - 44 
Pus, observations and experiments on, - - 2 94 
— - — agency of caloric on, - - 297 
■ agency of water on, - - 300 
agency of alcohol of wine on, - - 303 
to distinguish it from mucus, • - 304 
R. 
Rattle-snake , on the case of a man who died in consequence of 
its bite, - - - 75 
Rays, of the manner in which those that are separated by 
critical reflection or intromission come to the eye, - 1G9 
Reaumur, his observations on the luminous fluid, in the 
pholas dactylus, referred to, 280 
Refi -actions, the mean astronomical, according to several 
authors, - - 203 
Riding , on its salutary effects, - - 1 L 
Rings , seen in a prism, illustration of their dependence upon 
the critical separation, - - 1 5 7 
Ritter, M. his opinion of the nature of the bases of the fixed 
alkalies, confuted, - - - 1 7 
* — - his experiments on tellurium, mentioned 27 
Riville, his discovery of an animal which shed a blue lumi- 
nous liquor, referred to - - 281 
S. 
Salt, methods of making different varieties of, - 91 
, impurities in, 97 
, British large grained, equal to foreign bay salt, 108 
, and foreign, a comparison of their component 
parts, - - - 97 
Scheele, his views of the oxymuriatic and muriatic acids, 
correct, - - - 237 
Scolopendro electrica , its luminous fluid, - 280 
Sea , light of, always produced by living animals, 290 
Sea Sickness , on its causes, - - 6 
Shark , the oviviviparous, on its mode of breeding, 205 
Si lex, metal of, in cast iron, - 64 
— - — , hardens copper, 65 
Soda, muriate of, methods of analysing its several varieties, 108 
, new views of its decomposition, 24 7 
