ANALYTICAL INDEX. 



725 ; classification of, 729 ; Quetelet on the varieties of, 730 ; 

 origin of, 732,735, 746. 



Rain, average quantity of in different latitudes, 18, 19, 295; 

 periodical returns of, within the tropics explained, 700, note. 



Rau. Prof, on the increase of population, 776. 



READ, on the electricity of aqueous vapour, 304. 



REDI, extracted the brain of a tortoise, 599. 



REFRACTION, Sir I. Newton's theory of, 86 ; experiments on, by 

 M. Dulong, 88 ; by Sir D. Brewster, 91, a measure of the re- 

 lative quantities of caloric in bodies, 89, 91, 92; single and 

 double, 95 ; how modified by caloric, 95, note. 



REMEDIES, heroic, like some other heroes, destroy many lives, 1077. 



RENNIE, George, on the relative cohesion of different metals, 181. 



REPTILES, temperature of, 566 ; their imperfect developement, 

 579. 



RESPIRATION, how modified by external temperature, 709, expe- 

 riments on, by Crawford and Lavoisier, 711 ; increased by 

 cold, 710, 711 ; diminished by a high temperature, 710, 715; 

 of birds, 717; diminished in the lower animals by external 

 cold, 832, 833 ; diminished in a rarefied atmosphere, as found 

 by De Saussure, Gerard, and Gay Lussac, 869 ; how modified 

 by exercise and aliments, 876, 877 ; diminished after fatigue, 

 878, note ; theory of, 534, 559 ; on what becomes of the oxy- 

 gen inspired, 538, 540, 546 ; its influence on the temperature 

 and vital energy of animals, 561 ; experiments on, by Priestley, 

 Spallanzani, Humbolt, Provencal, Davy, Henderson, and Pfaff, 

 912; by Dulong, Despretz, Nysten, and Edwards, 913, 

 914, 915; diminished during sleep, 943, 944; by the de- 

 pressing emotions, 953, 954, by severe injuries, and painful 

 surgical operations 964 ; during the cold stage of fever, 1039 ; 

 augmented during fever, 1046. 



RICHERAND, on the leaping power of the grasshopper, 583; thinks 

 that life has the power of generating cold, 843 ; on tempera- 

 ments, 998. 



RIGIDITY, after death, 660, 661. 



ROBERTS, Cornelius, his account of a hurricane in Cuba, 347. 



ROGET, Dr., his definition of life, 664; on secretion, nutrition, 

 and animal temperature, 669 ; on hybernation, 828 ; on the 

 mean temperature of man, 844. 



ROSE, Gustav. his classification of Crystals, 94, on dimorphism, 

 96. 



Ross, Sir John, on the use of fat meats in the polar regions, 713. 



RUDOLPHI, on the brain of the Greenland whale, 596. 



RUMFORD, his experiments on heat, 9 ; his erroneous inference, 

 and how arrived at, 173 ; on the cooling of bodies, 192. 



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