ANALYTICAL INDEX. 



DROUGHTS, explanation of, 293. 



DUFAY, his theory of two electric fluids, 418 ; on the permeation 

 of glass by electricity, 441. 



DULONG, (and Petit,) on the specific heat of atoms, 81 ; his ex- 

 periments on combustion, 84; on the refractive power of 

 gaseous bodies, 88 ; on the expansion of gases by caloric, 112 ; 

 on the sources of animal heat, 535, 539, 558. 



DUMAS, on the sp. gr. of vapours, 67 ; on the relations of volumes 

 and atomic weights, 68. 



DYER, Mr. his views in regard to the cause of refraction, 87. 



DYNAMICS, geological 21 ; vital, 672. 



DYSPEPSIA, proximate cause of, 954-5, note. 



EARTH, inclination of its axis, and variations of, 27, 29; annual 

 velocity of, round the sun, 32 ; great changes it has under- 

 gone. 



EARTHQUAKES, of Cutch, and of Chili, 21, note; theory of, 

 403 ; their frequency in South America. 



EARLE, Mr. on the circulation of the nervous fluid, 594. 



EDEN, garden of, 731 ; its great extent, 731-32; the primitive 

 home of the human race, 745. 



EDWARDS, Dr. on the sources and cause of animal heat, 536, 

 879 ; supposed that animal heat is evolved in the general cir- 

 culation, 538 ; his experiments on respiration, 539 ; on the 

 proportion of oxygen expired as carbonic acid, 539 ; maintains 

 that oxygen unites with carbon in the general circulation, 546 ; 

 on the quantities of oxygen consumed by birds, 578, note ; 

 refers vital energy to the nervous system, 593 ; refers animal 

 temperature in part to the blood corpuscles, 643 ; on the in- 

 fluence of season on the amount of respiration, 717 ; his views 

 untenable, 717 ; his theory of fever, 717, note ; on the influ- 

 ence of external cold in diminishing respiration, 793, note ; on 

 the temperature most favourable to life, 829 ; his experiments 

 on batrachians, 829, 882 ; on young puppies, 837 ; on partial 

 cold bathing, 849 ; on the effect of immersing young kittens in 

 ice-cold water, 852 ; further experiments of, 914 ; his impor- 

 tant experiments on the absorption of nitrogen by respiration, 

 914. 



EGYPTIANS, their artificial incubation, 641 . 



ELECTRICITY, six various definitions of by Faraday, Preface viii ; 

 identical with caloric, 14; theory of, involved in the utmost 

 obscurity, 201 ; regarded as the cause of chemical affinity, 

 201; views of Sir H. Davy on, 202-5; of Berzelius and 

 Becquerel, 206 ; of Dr. Thomson, 207 ; not the most universal 

 agent in nature, 208, 282; convertible into caloric, 209 ; hy- 

 pothesis of Dr. Hare, 209 ; general diversity of opinion in re- 



