nsects, sounds produced by, 377. 
ntestines of animals, root-organs turned 
inwards, 243, 244, 247. 
ntensities of colours, comparison of, 35. 
ntroversion of root-organs in animals, 
243, 244, 246. 
Involvolus of Plautus and Festus, 186, 
lodide of spiroil, 166. 
Todides, metallic, law of composition, 435. 
lodine, property of, 596. 
Ips of Homer and Chrysostom, 205. 
lodic gas, spectrum of light of, 478. 
rritability of plants, 241. 
, vegetable and animal com- 
pared, 252. 
Jacobi, on the application of electro-mag- 
netism to machines, 503. 
Jenkins, curious experiment of, 528. 
Julus of Aristotle and Hesychius, 184. 
‘Kampe, the vine-moth of Aristotle, of 
Theophrastus, Pliny, the Septuagint, 
Chrysostom, Pope Zachary, Celumella, 
and Palladius, 183, 220. 
Kermes, preparation of, 433. 
Kieselguhr, description of, 400. 
Kingdoms of nature, life and affinity of 
the, 223. 
Keelle, his chemico-microscopical exposi- 
tion, 570. 
Kulpoda 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, erystals 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 Cephalotes, 202. 
_Leuciscus papyraceus of Agassiz, 402. 
Liebig’s experiments on chlorine, 273. 
Life, Dr. Carus’s general conception of, 
224; its endless variety of furms, 224 ; 
an original principle, of which the body 
is one of the phenomena, 225; the 
manifestation of an internal principle ° 
through outward forms, and of unity 
through multiplicity; nature one in- 
finite life, in which single forms are 
constantly merging, 225; life of the 
different kizgdoms of nature; of the 
inorganic kingdom, 228; physical life, 
235; planetary life, 230; life of the 
earth, water essential to it, as wellas to 
INDEX. 
635 
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 half within the other; plant, one 
half wpon 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 division into 
colours, 487; limit of lines determined 
by the intensity cf, 579; motion of, in 
the atmosphere, 393 ; phzenomena of, 
theories for the explanation of, 568; 
propagation of, 490; refrangibility of, 
$92; relative intensities of, 499; theory 
of retardation of, 579; undulatory 
theory of, 477, 569. 
——., artificial, effects of, 112. 
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, 261. 
, hydrate of, properties of, 270. 
Liquids, density of, 593. 
Locatelli lamp, description of, 40. 
Locusta aptera, devastation of, 200. 
Léwig on the essential oil of Spirea ulma- 
ria, 153. 
MacGauley, on the application of mag- 
netism as a moving power, 547. 
