INDEX. 
367 
M. 
Marcet (W.). An Account of the Organic Chemical Constituents or Immediate Principles of 
the Excrements of Man and Animals in the Healthy State, 265. 
Metals , musical tones in, produced by heat, 4. 
N. 
Newport (G.). Researches on the Impregnation of the Ovum in the Amphibia; and on the 
Early Stages of Development of the Embryo, 229. 
Nitrotoluylic acid, products of the decomposition of, 43 ; nitrotoluylamide, 44 ; action of reducing 
agents on, 46 ; toluyl-urea, 48 ; carbo-toluylic acid, 50. 
Noad (H. M.). On some of the Products of the Decomposition of Nitrotoluylic Acid, 43. 
O. 
Osmometer, description of, 185. 
Osmose, phenomena of, 178. 
Osmotic force, definition of, 177 ; osmose, how produced, 178; not an effect of capillarity, 180; 
evidence of chemical activity, 183; electrical endosmose, 184; description of osmometer, 185; 
osmose in membrane and in earthenware compared, 187 ; effects with different acids, 191 ; 
tables of experiments with alcohol, 194; osmose of sugar, 195; of sulphate of magnesia, 199; 
of chloride of sodium, 201; of chlorides of barium and calcium, 204; of potassium and sodium, 
205; of carbonate of potash, 206; of sulphates of potash and soda, 211 ; of oxalate of potash, 
& c., 213 ; of barium, strontium, &c., 215; of acetate of alumina, 217 ; of magnesian chlorides, 
219; of nitrate of lead, 221 ; of various metals, 222; of nitrate of uranium, 223 ; solutions of 
mercury, 223; opposite results with acid and alkaline salts, 225; unosmotic salts, 226 ; osmose 
in living membrane, 227. 
Ovum, impregnation of, in the Amphibia, 229 ; method of observation, 230 ; penetration of yelk by 
spermatozoa demonstrated, 232 ; appearances of the yelk after fecundation, 234 ; production 
of the body and head of the embryo, 240 ; primary cleft correspondent with axis of future 
embryo, 241 ; power of spermatozoon to influence direction of primary cleft, 242. 
P. 
Pollock (Sir F.). On certain Properties of square numbers and other quadratic forms, with a 
Table of odd numbers from 1 to 191, divided into 4, 3 or 2 square numbers, the algebraic 
sum of whose roots (positive or negative) may equal 1, by means of which Table all the odd 
numbers up to 9503 may be resolved into not exceeding 4 square numbers, 311. 
Power (J.). Theory of the Reciprocal Action between the Solar Rays and the different Media 
by which they are reflected, refracted, or absorbed ; in the course of which various optical 
laws are elucidated and explained, 11. 
Q. 
Quantics, definition of, 245 ; examples of, 247 ; the covariants of, 250. 
R. 
Rankine (W. J. M.). On the Geometrical Representation of the Expansive Action of Heat, and 
the Theory of Thermo-dynamic Engines, 115. 
