635 



liibccts, sounds produced by, 377. 



Intotines of animals, root-organs turned 

 inwards, 243, 244, 247. 



Intensities ot colours, comparison of, 35. 



Introversion of root-organs in animals, 

 243, 244, 24(i. 



Involvolus of Plautus and Festus, 186, 



Iodide of spiroil, 166. 



Iodides, metallic, law of composition, 435. 



Iodine, property of, 596. 



Ips of Homer and Chrysostom, 205. 



Iodic gas, spectrum of light of, 478. 



Irritability of plants, 241. 



, vegetable and animal com- 

 pared, 252. 



Jacobi, on the application of electro-mag- 

 netism to machines, 503. 



Jenkins, curious e.\periment of, 528. 



Julus of Aristotle and Hesychius, 184. 



Kampe, the vine-moth of Aristotle, of 

 Theophrastus, Pliny, the Septuagint, 

 Chrysostom, Pope Zachary, Columella, 

 and Palladius, 183, 220. 



Kermes, preparation of, 433. 



Kieselguhr, description of, 400. 



Kingdoms of nature, life and af&nity of 

 the, 223. 



Koelle, his chemico-microscopical exposi- 

 tion, 570. 



Kvlpoda Cucullus, ovarium of, size of the 

 granules in, 574. 



Lagrange, theory of, 548. 



Lambert's theory of the solar heat which 

 falls upon the earth, 137. 



Lamp, Locatelli's, description of, 40. 



, reverberatory, 583. 



Laws of cooling in bodies, 125. 



Law of the diffusion of gases, 394. 



, of the propagation of caloric, 24. 



Lead, crystals of the protoxide of, 424. 



Lenz, on the conducting power of wires, 

 311. 



— — on the laws according to which the 

 magnet acts on a spiral, 608. 



Lethrus Cephalotcs, 202. 



Leuciscus papyraceiis of Agassiz, 402. 



Liebig's experiments on chlorine, 273. 



Life, Dr. Carua's general conception of, 

 224 ; its endless variety of forms, 224 ; 

 an original principle, of which the body 

 is one of the phaenomena, 225 ; the 

 manifestation of an internal principle 

 through outward forms, and of unity 

 tlii'ough multiplicity ; nature one in- 

 finite life, in which single forms are 

 constantly merging, 225; life of the 

 different ki:;gdoms of nature ; of the 

 inorganic kingdom, 228; physical life, 

 235; planetary life, 230; life of the 

 earth, water essential to it, as well as to 



animal and vegetable life, 230 ; life of 

 crystals, as distinguished from organic 

 life, 230, 234, 242 ; organic life, 234 ; 

 vegetable life, 234 ; distinguished from 

 animal life, 234 ; the line the arche- 

 type of the plant, the globe the arche- 

 type of the animal, 234, 244 ; animal ex- 

 ists one haW ivithiti the other; plant, one 

 half ujion the other, 235; relations of 

 vegetable life to universal life and to 

 inorganic nature, 239 ; to the life of the 

 earth, 241, 242 ; animal life, 242; per- 

 fect unity its characteristic, 242 ; di- 

 stinguished from vegetable life, 234, 

 244; its relation to the universal life of 

 nature, 246; metamorphosis of vege- 

 table into animal life, 246, 250; of 

 animal into vegetable, 572 ; develop- 

 ment of the animal organism, 246; ani- 

 mal an introverted plant, 246 ; absorb- 

 ing and exhaling poles, 25! ; circulation 

 of the fluids, centrifugal and centipetal, 

 251 ; animal sensation, 252; the ner- 

 vous life, 252; psychical life and self- 

 consciousness, 252 ; animal life develop- 

 ed out of the life of the lower kingdoms 

 of nature, 253; metamorphosis of de- 

 stroyed organic substances into ele- 

 mentary forms of life, 560. 



Life, infusorial, duration of, 567. 



• , organic, unfathomableness of, 576. 



, vegetable, carbonated products of, 



584. 



Light, absorption of, 477; circular polar- 

 ization of. Dove on, 75 ; diffraction 

 of, 480; division of, 491 ; influence of, 

 on vegetables, 598; its divis'on into 

 colours, 487; liniitof lines determined 

 by the intensity of, 579; motion of, in 

 the atmosphere, 393 ; phaenomena of, 

 theories for the explanation of, 568; 

 propagation of, 490; refrangihility ot, 

 392 ; relative intensities of, 499; theory 

 of retardation of, 579 ; undulatory 

 theory of, 477, 569. 



, artificial, effects of, 1 12. 



Light and heat, identity of, 37. 



, identity of the agents pro- 

 ducing them, 388. 



Lime, effect of, on plants, 589. 



, ferriferous carbonate of, 260; struc- 

 ture of, 260; primitive form of, 2G1. 



, hydrate of, properties of, 270. 



Liquids, density of, 593. 



Locatelli lamp, description of, 40. 



Lociista aptcra, devastation of, 200. 



LiJwig on the cssentiiil oil oi Spirceu uhna- 

 ria, 153. 



MacGauley, on the application of mag- 

 netism as a moving power, 547. 



