INDEX. 
page 
Rays , experiments on the dark ones of Ritter, - - 15 
Reaumur s porcelain, on the conversion of glass into it, - £"92 
Relinasphaltum , name given to a bitumen from Bovey, - 4 10 
Rhodium , name given to a metal found in platina,, - 419 
Rigel, on its motion, - - - - 379 
Ritter , experiments on his dark rays, - - 15 
Rowley rag, description of, - - - 281 
Rumford, Benjamin Count of. An account of a curious 
phenomenon observed on the glaciers of Chamouny ; to - 
gether with some occasional observations concerning the 
propagation of heat in fluids, - 23 
An enquiry concerning 
the nature of heat, and the mode of its communication, 7 7 
Russell, Patrick, M. D. Observations on the orifices 
found in certain poisonous snakes, situated between the 
nostril and the eye, - 70 
Remarks on the voluntary ex- 
pansion of the skin of the neck, in the Cobra de Capello or 
hooded snake of the East Indies, - 346 
S. 
Sap in trees, experiments and observations on its motion, I83 
Schistus, remarkable, description of, - 389 
analysis of, - - - 393 
Serpentarii p, on its motion, - * - - 374 
Serpentis FI. 49, on its motion, •* - - - 376 
— d, on its motion, - - - 37 8 
Smithson , Mr. Remarks on his opinion respecting crystal- 
lization, - - - - - -291 
Snake , hooded , on the expansion of the skin of its neck, - 346 
Snakes , on the orifices found in certain poisonous ones, 70 
Solution , supposed not to be necessary to crystallization, - 291 
Stars , double , on the changes in their relative situation, 353 
Steam tubes, method of improving them proposed, - 179 
Subcarburets of iron, on the proportion of carbon in them, 343 
Sulphur, on its combination with iron, - - 32 7 , 343 
Sulphuret of copper, observations on the different kinds, 30, 52 
of iron, remarks on, - 55 > 315 
of lead, antimony, and copper, description of, - 30 
- analysis of, - 63 
Sweat, remarks on its effects, - - - 1 33 
Swimming bladders , remarks on those of some fishes, - 19 
