] XDKX 



IpBTHYOPSWA, ik'thyop'sidah {G. 

 irhthys, fish; o^.v/.s. appearance i . 



definition of 63 



WHTHYOPTER YGIA , ik'thlopteri j 'la 

 __ - ;-(G. ichthys, fish -f- pteryx, whig). 



definition of .... 707 



I V HT HY OR \ I T HI FOR ME* (G, 

 . ichthys, fish -f ornis, bird) ... , . . . .425 



An order of fossil, toothed-bird- 

 \vith teeth in .separate sockets. 

 ICHTHYO tiAURti, ik'thiosars (L. 



ichthyosaurus, fish-like lizards) . . -. .690 

 IGNEOUS FORMATIONS, ig'nf>us ( L. 



iV/nta, fire) . definition of . ,393 



IGUAXA TCni-RCJLATA. igwa'iia 

 (Sp. iguana, from native Carib 



name) . 655 



ILEUM. iU'eum ((J. filo. twist) .. . .) t S, J,9 



Definition of 338, 748 



ILIACUS, ili'akiis (L. iliaciis. relating 



to the colic J .,'. 80 



ILIO-COSTALIS MUSCLE, lll'Iu-kos'- 

 talis '(<}.. eilo -f L. costa, rib) .... ..829 



ILIOPSOAS, iliop'soas (L. ilium, the 

 flank -f- G. psoa, a muscle of the 



loins), definition of . 83 



ILIUM, ill'eeum (L. flank) . . ' . ? 



llumologiie .. . .704 



IMAGE, im'aje, APPOSITION/ (T,. 



/mar/o, _ image), definition of 322 



Mosaic, definition of .321 



Stipple, definition of ............ 321 



Superposition, definition of 322 



I .NT AGO, mia'go (L. imago,' image) . . .331 



Definition of 348 



IMMUNITY, imii'niti (L. im MIDI is, 

 exempt from public service) .. .194. 201 



Active '.197 



Artificial 197 



familial 190 



Individual 19(5 



Natural ........: 197 



Passive 197 



IMPERFECT FLOWER, definition of.22S 

 IMPLANTATION, implanta'slum (L. 



in + plantare, to plant).. . 624 



IMPORTANCE VS. ( oXspiCUOUS- 



NESS :... 32. 375 



IMPREGNATION, Im'pregna'slmn (L. 

 impraegnare, to fertilize), definition 



f .105 



(See also fecundation, fertiliza- 

 tion, etc.) 



IMPULSE, im'puls (L. impnJsiift. im- 

 pelled) 17s 



INCISOR, insi'sor (L. incido. cut 



into) 70^ 



Teeth 73 / ; 



INCISURES OF SCHMIDT, definition 



of 114 



INCOME, LOSS OF BY INSECTS. . . .332 

 INCOMPLETE Fl BRO - VA Rf ' ULA R 



; , BUNDLES, drtiniuon of., .232 



I. \CHKASK IN FLIES 370 



INCUS, inn'kuss (L. anvil) ,%T 



J X I ) ENTATION. indenta'shun (L. "in- 

 . dentare, to indent), definition of/. .106 

 INDEX FINGER, in'dex (L. indicare, 



,t to indicate), definition of 710 



Fossils 39S 



MDUSIUM, indu'zium (L. induere, to 



put on) 225, 242 



INFECTIONS, BY CESTODES, infek'- 

 shun (L. infic$re, to infect) ....... .295 



, By nematodcs 302 



Mixed . . 196 



Trematode .....' "... .29 1 



I X FECTIVE TREMATODES [".... 2.' > 



INFRAORBITAL LINE, in'fraor'bltal 



(L. infra, below + orbis, circle) .. .582 

 INFUNDIBULUM, inn'fundib'yulum 



( L. funnel ) 0.7 



(See also hypophysis, pituitary 

 body. ) 



Definition of 66, 852 



Of oviduct j/fO 



fXFVSORIA, in'ffizo'riu (L. infusus, 

 poured into + forma, shape) . .419, 427 



definition of 153 



Why so named 138 



1NGEN-HOUSZ 381 



INGESTED (L. ingestus, taken in).. 63 

 TNGESTION (L. ingestus, taken in) . . 30 

 INGLUVIES, Tngloov'Jez (L. ingluvies, 



crop ) 338, 744 



INHERITANCE, inher'itiins (L. in + 



heres, heir ) 157 



INHIBITION, m'hibish'on (L. ink-Mere, 



to prohibit) 52 



INHIBITORY FIBERS, definition of. .847 

 INITIATIVE, inish'iativ ( L. initiare, 



to begin), definition of 17 



INNER CELL MASS, m'er (A. S. inra, 



inside), definition of 621 



INNER EAR 



Of frog 45 



INNER STIMULUS, definition of.... 178 

 INNER VATION, m'nervfi'shun (L. in, 



into + nervus, sinew) 46, 77 



INNOMINATE, inn'nomm'inate (L. 



innominatus, without a name) 



Artery 755 



INNOVATION BRANCHES, in'ovfi'- 



shun (L. innoi'are. to renew) 220 



INORGANIC, inorgan'ik (F. inor- 



ganique, inorganic)' , 95 



I \NKCTA, insek'tn (L. insectus, cut 



ff) 328-374, 429 



R*e 353 



Fly 367 



Grasshopper 332 



Alternation of generations in 346 



Central nervous system of. . .330, 359 

 Embryology of 346, 362 



