ANALYTICAL INDEX. 



active principle in, but not identical with, 100, note ; chemical 

 effects of, 101 ; decomposition of, by Sir D. Brewster, 102 ; 

 ornamental effect of its decomposition on a grand scale, 102, 

 note ; all the elements of ponderable matter compounds of, 

 103; the Trp^rrj v\rj of the ancients, 104; cosmical phe- 

 nomena of, 104, 106; a revelation of all that is beautiful in 

 the outward universe, 1 04 ; a key to the ultimate mechanism 

 and laws of nature, 104; existed before the sun, moon, and 

 stars, 105, note; the basis of all material existence, 106; 

 vibratory theory of, explains nothing fully, not even the cause 

 of vibrations, 107, note ; chemical affinities of, 102, 110; 

 electric, feeble in an exhausted receiver, 100; important ex- 

 periments of Fusinieri on, 443, 444. 



LIGHTNING, cardinal facts connected with its theory, 298 ; its 

 connexion with hurricanes, tornados, hail storms, &c. 330, 

 347 ; atmospheric aqueous vapour the source of, 300, 301 ; 

 regarded by Seneca as identical with caloric, 302 ; an impor- 

 tant observation of the author on, 303, 304 ; views of Anaxa- 

 goras and Dr. Hare, 306, note; of Epicurus, 317 ; cause of 

 its zig-zag and forked appearance, 336 ; its identity with the 

 cause of evaporation, 305, 317 ; mechanical effects of, 444, 

 445 ; suddenly forms glass tubes or fulgorites in banks of 

 sand, 448. 



LIME, carbonate of, assumes different crystalline forms, 95 ; the 

 dazzling light it affords when ignited, 223. 



LIQUIDS, constitution of, 137 ; Boyle and Newton on the cause 

 of their viscidity, 138 ; theory of their volatility, 139 ; of their 

 cohesion, 148, 149. 



LOCKE, John, on the origin of all ideas, 857. 



LOGIC, physical, the foundation of, 16 ; characteristic specimen 

 of, by Aristotle, 857, note. 



LONG, Major, on the colours of the North American Indians, 

 752. 



LONGEVITY, among the different nations of Europe, 761, 762; 

 in the United States, 763 ; in ancient Greece and Rome, 764, 

 765 ; in town and country, 766 ; in India and China, 769 ; 

 in hot climates, 770, 772; of men belonging to the learned 

 and liberal professions, 777 ; among different classes in 

 England and Wales, 778; .of slaves in the United States, 

 763. 



LUCRETIUS, his theory of transparency and opacity, 138, note ; 

 on the epicurean theory of cohesion, 1.16, note ; on the vacuum, 

 273; on the nature of lightning, 317; on the circulation of 

 elementary fire, 485, note ; on the vital principle, 480. 



LUNGS, the real source of animal heat, 548 ; have a higher tem- 

 perature than other parts of the body, 549, 550, 553 ; 



