403 



INDEX. 



PAGE. 



Proteids, occurrence of ... 213 

 ,, qualitative tests for 215 

 ,, ultimate composi- 

 tion of 213 



Prussic acid ... ... ... 7 



Pyrolusite, composition of ... 16 

 Ptyalin, action on starch . . . 268 

 Pyrethrum as an insecticide... 

 Pyro-catechiii sulphuric acid 

 in urine ... ... ... 277 



Quartz 17 



,, composition and pro- 

 perties of ... ... 40 



Quercitrin, rhanmose occur- 

 ring as ... ... ... 199 



Quinine, composition of ... 220 



Radicle, determination of di- 

 rection of growth of ... 224 

 Rain, acidity of .. ... 35 



Rainfall, the average at 

 Rothamsted ... ... 73 



Rain-water, analyses of 31, 32 

 ,, chlorine in ... 74 



Rape seed, calorific power of 



oil of ... ... 5 



,, ,, cake, value as a food 280 

 ,, ,, cake, digestible 



constituents of 289 

 Rations, ratio of water to dry 



matter in 297, 298, 299 

 standard 295, 296, 297 



Recknagel's phenomenon ... 315 

 Redonda phosphate, composi- 

 tion of ... ... ... 153 



"Refraction," valuation of 

 nitrate of soda by ... ... 178 



Rennet, coagulation of casein 



by 336 



,, temperature most 

 favourable to action 



of 336, 337 



Rennin, the enzyme ... ... 310 



Resins, see " Essential oils" 



, , divisions of the . . . 211 

 , , how produced . . . 211 



the gum 212 



,, the hard, composition 



of 211 



Respiration, changes produced 



by ... ... 263 



,, in animals, pro- 



cess of ... 262 



, , in leaves . . . 232 



Respirations, number of per 

 minute .. 263 



PA(JK. 



Respiratory quotient . . . 263 

 Rhanmose, composition and 



occurrence of ... 198 



, , reduction of ... 199 

 Ribose, action of reducing 



agents on ... 198 



Rice, bye-products from ... 282 



,, meal 282 



,, polish 283 



Ricinoleic acid, occurrence of 203 



Rocks, calcareous decay of ... 43 



,, classification of ... 39 



, , nietamorphic . . ... 42 



,, sedimentary .. ... 42 



Rock salt, occurrence of chlo- 

 rine in ... ... ... 17 



Root crops, composition of ... 252 



Roots, the function of ... 225 

 Root hairs, nature of acids 



contained in... 208 

 ,, ,, strength of acid 



in 208 



,, pressure ... ... 229 



,, ,, measurement of 229 



Rosin, composition of ... 211 



Rye, the crop of 241 



Rye grass, composition after 



being in silo... ... ... 249 



Saccharates, formation and 

 decomposition of ... ... 195 



Saccharobioses, composition of 194 

 Saccharomyces cerevisia^, see 



"Yeast" 193 



Saccharose, occurrence and 

 properties of .. ... 195 



Salicylic acid, use as a milk 

 preservative... ... ... 343 



Saliva, amount secreted ... 268 

 ,, composition of ... 268 



,, enzyme of ... ... 268 



,, various compounds 



present in ... ... 268 



Salts, inorganic in plants, the 212 



"Salufer" 370 



Sand, properties as a soil con- 

 stituent 49 



Sandarach 211 



Sandstones, the decay of ... 43 

 ,, see " Sedimentary 



rocks" ... 42 



"Sanitas" 371 



Sarcin in muscle .... ... 265 



Sarcolactic acid in muscle ... 265 



Sawdust as litter 118 



,, main constituent of 118 

 Scammonium ... .. ... 212 



Scheele'sgreen as an insecticide 376 



