GENERAL INDEX. 



80o 



Lr.c. cunt in unl. 



posterior region of the leg, iii. 132. 

 muscles, iii. 132. 



superficial layer, iii. 132. 



gastrocnemius and soleus, iii. 132. 

 division of tlie tendo Achillis, iii. 132. 

 plantaris, iii. J33. 

 deep layer, iii. 133. 

 arteries, iii. 133. 



posterior tibial, iii. 133. 

 course, iii. 133. 

 relations, iii. 133 

 operation for ligaturing, iii. 133. 

 per<>ne.al, iii. 134. 

 course, iii. 131. 

 relations, iii. 13-1. 

 operations lor ligaturing, iii. 134. 

 venae comites, iii. 131. 

 nerve, iii. 134. 

 deep lymphatics, iii. 134. 

 difficulty of preserving the proper position of the 



fibula in fracture, iii. 134. 



prei aution with respect to the projecting angle which 

 the tibia, when amputated, presents anteriorly, iii. 

 13ft. 

 arteries requiring ligatures in amputation of the, iii. 



135. 



remarks on the application of artificial legs, iii. 136. 

 the most eligible situations for exposing the tibia in 



order to trephine, &c., iii. 13'i. 

 liability of the tibia to disease, iii. 13'3. 

 curve of the tibia, iii. 136. 

 fracture of the leg, iii. 130. 



of the fibula alone, iii. 136. 

 LEG, muscles of the, iii. 137. 

 anterior group, iii. 137. 



1. tibialis anticus, iii. 137. 



2. extensor longus digitorum, iii. 137. 



relations, iii 137 

 action, iii. 137. 



3. extensor proprius pollicis, iii. 137. 



action, iii. 137. 

 relations, iii. 137. 



4. peroneus tertius, iii. 137. 



relations, iii. 137. 

 action, iii. 138. 

 external group, iii. 138. 



1. peroneus longus, iii. 138. 



action, iii. 138. 

 relations, iii. 138. 



2. peroneus brt-vis,iii. 138 



combined action, iii. 138. 

 posterior group, iii. 13S. 

 superficial layer, iii. 138. 



1. gastrocnemius, iii. 138. 



relations, iii. 138. 



2. soleus, iii. 138. 



relations, iii. 138. 

 tendo Achillis, iii. 139. 

 action, iii. 139. 



3. plautaris, iii. 139. 



action, iii. 139. 

 deep layer, iii. 139. 



1. popliteus, iii. 139- 



2. flexof longus digitorum, iii. 139. 



accessory muscles, iii. 13S. 

 action, iii. 139. 

 relations, iii. 140. 



3. flexor longus pollicis, iii. 140. 



action, iii. 140. 



4. tibialis posticus, iii. 140. 

 See also FOOT, muscles of the. 



Legs of animals, motion of the, iii. 411. 



the legs move by the force of gravity as a pendulum, 

 iii. 411. 



office of the, in the progression of man, iii. 457. 



legs of insects, ii. 931 ; iii. 442. See INSECTA. 



reproduction of legs in Crustacea, i. 760. 

 Leguminous seeds, properties of, as loud, ii. 13; s. 394. 



constituents of, s. 3<J4. 



I.cmtnhig, economy and mode of proceeding of, iii. 17. 

 /.ewOM-juice. considered as an article of food, s. 3'J5. 

 Lemur, a genus of Quadrumana, iv. 215, el scq. See QUA- 



nKTMANA. 



characters of the genus, iv. 215. 

 organs and mode of locomotion of the, iii. 45G. 

 flying (Galeopithecus), teeth of the, iv. 870. 

 tardigradus, iii. 45i. 



Lemurina:, a family of Quadrumana, iv. 214. et scq. 

 characters of the family, iv. 214. 

 genera and species of, iv. 214, 215. 

 Lens, crystalline, of the eye, ii. 194. See also Crystalline 



leris ; EYE. 



form of the lens, iv. 1440. 



retractive index of the surface of the lens, iv. 1440. 

 Lenses, influence of convex and concave, on the rays of 



light passing through them, iii. 331. 

 convex lens described, iii. 337. 

 Dr. Brewster's lens of diamond, sapphire, or carbuncle, 



iii. X37. 



Dr. Wollast on's doublet, iii. 338. 

 Cuddington lens, iii. 339. 



Lcnsi-s continued. 



Stanhope lens, iii. 339. 

 achromatic lenses, how obtained, iv. 143*. 

 Lenticular bone, ii. 547- 



or ciliary ganglion, ii. 281 ; iii. 785; iv. G2i'. 

 glands of the stomach, s. 324. 

 nerve, ii. 281 ; iii. 785. 

 process of incus, ii. 547. 

 Leopard, organs of voice of the, iv. 1490. 

 powers of leaping of the, iii. 474. 

 urine of the, iv. 1279. 

 I.efxutt'lla, a genus of Kotlfera, iv. 406. 

 Lepadicea, a genus of Cirrhopoda, i. 6H4. See CIRKHOPOIM. 

 l.epas, nervous filaments of the, iii. 607. 

 l.cpidoptera, an order of Insecta, ii. 866. 

 characters of the order, ii. 866. 

 divisions into sections, ii. 866, 867. 

 mode of flight of the, iii. 421 . 



mode of flight of the nocturnal Lcpidoptera, iii. 



422. 



nervous system of the, iii. 61 1. 

 ovum of Lepidoptera, s. [111.] [113.] 

 Lcpidusiren, iii. 990. 



respiratory and circulatory apparatus in the, iii. 990. 

 muscles of the, iii. 543. 

 Leptuclinum, a genus of Tunicata. iv. 1191, ct scq, 



characters of the genus iv. 1191. 

 Leptopus longipes, organs and mode of progression of the, 



iii. 445. 



Lepus, or hare, anatomy of the, iv. 3f!9, el seq. 

 Lepus cuniculus (rabbit), nervous system of the, iii. 623. 



organs of voice of the, iv. 1491 . 

 Lesueura vitrea, nervous system of, iii. 602. 

 Lethargy. See HIBERNATION. 



Leucctthiopes, Leuctethiopia, and Leucopathia. See AL- 

 BINO. 



Lcucin, iv. 164. 

 Leucoma of the cornea, ii. 177 

 Leucorrhea, s. 694. 707. 

 Leucophrys, or ciliated animalcule, iv. 13. 

 Levator alae nasi proprius muscle, iii. 729. 

 anguli oris muscle, ii. 224. 



relations and action, ii. 224, 225 

 anguli scapulae muscle, i. 370 ; iv. 576. 

 ani muscle.i. 178; iii. 944 ; iv. 1246; s. 138. 309. 

 action, i. 179. 

 origin, i.|178. 

 labii superioris alajque nasi muscle, ii. 222.224. iii. 



728. 



relations and action, ii. 222. 224 ; iii. 728 

 menti muscle, ii. 225. 



relations and action, ii. 225. 

 palati muscle, i. 734 ; iii. .951, 952. 



relations and action, iii. 952. 

 palpebrae superioris muscle, iii. 79 82. 784. 



action of the levator, iii. 78H. 



Levatores breviores costarum muscles, iv. 334. 1055. 

 longiores costarum, iv. 1055. 

 prostataa muscle, iv. 147. 1246 

 urince muscles, i. 178. 

 Lever, theory of the, in animal dynamics, iii. 410. See 



Mo i ION, ANIMAL. 

 LibcUulina, or dragon flies, ii. 864. 

 characters of ihe section, ii. 864. 

 wings and mode of flight of the, iii. 423. 

 Lichanotus, a genus of Quadrumana, iv. 215, et seq. See 



QUADRUMANA. 



characters of the genus, iv. 215. 

 Lichens, reproductive system of, s. 228. 



formation and development of the germ, s. 22S. 



the thallus, s. 229. 



the hypotliallus, s. 229. 



the receptacles within or upon which the spores or 



spore-like organs are produced, s. 229. 

 varieties, apothecia, s. 229. 



spermogoniae, s. 229. 

 pycnides, s. 229, 230. 

 lamina proligera, s. 229. 

 paraphyses, s. 230. 

 thecae, s. 230. 

 antheridia of lichens, s. 230. 



function of, s. 230. 

 pycnides of lichens, s. 230. 



summary of reproductive organs of lichens, s. 231. 

 L>en. See SPLEEN. 



Lienculi, seu lienes succenturiati, iv. 771. 

 Life, expectation of human, iv. 1474. 



duration of, and causes by which it may be lengthened 

 or shortened, iv. 14fi9. See VITAL STATISTICS. 

 mean duration of, iv. 1474. 

 average duration of, the same amongst all races of 



mankind, iv. 1337. 

 tenacity of, among some of the lower animals, property 



of, iii. 30. 

 a-sociated with a high degree of irritability of the 



muscular fibre, iii. 36. 

 LIFE, iii. 141. 



I. General views, iii. 141. 

 definition, iii. 141. 

 tendency of the changes exhibited by a living 



being, iii. 141. 

 method of prosecuting the inquiry, iii. 141. 



