Index 



46? 



OESOPHAGUS, esof'agus (G. oesopha- 

 gus, gullet ) 49 



The canal through which food 



passes to the stomach. 



OIDIA, oid'ia. See oidium 211 



OIDIOMYCOSIS, oid'iomyko'sis (G. 



oidium + mykos, a fungus -f- osis) .213 

 The presence in the body of fungi 



as parasites. 

 OIDIUM, oid'ium (G. oon, egg + dim. 



suffix, idion) 212 



A genus of parasitic fungi. 



OKEN, o'ken 417 



A German naturalist, 1779-1851. 

 OLFACTORY, olfak'tori (L. olere, 



smell) 62, 68 



OLIGOCHAETA, ol'igoke'ta (G. oligos, 



few + chaite, hair) 284, 423 



A class of Annelida. 

 OMMATIDIUM, om'atid'ium (G. omnia, 



eye) 323 



OMOSTERNUM, o'moster'num (G. 



omos, shoulder + sternon, breast) . . 76 

 ON I SOUS ASCELLUS, onis'kus asel'us 



( G. oniskos, a wood-louse ) 327 



Typical genus of Oniscidae. 

 ONISCIDAE, onis'ide (G. oniskos, 



wood louse + idae, family) 432 



ONYGOPHORA, onikof'ora (G. onos, a 



claw or nail + pherein, to bear) . . . 



423, 431 



OOCYST, o'osist (G. oon, egg + kustis, 



bladder) 133 



OOCYTE, o'osit (G. oon + kytos, cell). 100 

 OOECIUM, oe'shium (G. oon, egg + 



oikos, house) .311 



A brood-pouch. 

 OOGENESIS IN EARTHWORM, 



oojen'esis (G. oon -f- genesis, de- 

 scent) 279 



OOGONIA, plural of oogonium 100 



OOGONIUM, oogd'nium (G. oon + 



gonos, offspring) 442 



OOKINETE, ookinet' (G. oon + 



kinein, to move ) 133 



OOSPORA BOVIS, o'ospora (G. oon + 



sporos, seed) 215 



OOSPORE (same as oospora) 152, 18S 



OOTYPE, o'otype (G. oon + type, 



place) 297 



Place where the shell is formed. 



OPALINA, opali'na (like opal) 155 



OPEN CIRCULATION, definition of. 271 

 OPERCULUM, oper'kulum (G. opercu- 

 lum, a lid)' 211 



Of plants 221 



OPHIDIA, ofid'ia (G. ophis, serpent 



+ eidos, form ) 427 



OPE I U ROI DE A, of'iuroi'dea ( G. 



ophiouros, serpent-tailed) 422, 431 



OPHTHALMIC, ofthal'mic (G. opthal- 



mikos, of or for the eyes) 320 



OPILIONES, opilio'nez (L. opilio, a 



shepard ) 424 



An order of Arachnids. 

 OPISTHOBRANGHIA, 6pisthobrang / - 

 kia (G. opisthe, behind + branch, - 



gills) 423 



OPISTHOGONEATA (G. opisthe + 



gone, genitalia ) 424 



A sub-class of Myriapoda. 

 OPISTHORCIS FELINEUS, opisthor'- 

 kis felin'eus (G. opisthe + orchis, 



testicle) 293 



Noverca 293 



Sinensis 293 



OPSONIN, op'sonin (G. opsonein, to 



cater), definition of 201 



OPTIC CHIASMA (G. opsis, sight) ... 68 



Nerve 



OPTICAL SECTION 279 



OPTIMUM, op'tinmm (L. opiimus, 



best ) , definition of 130 



ORAL OPENING (L. os, mouth) 48 



ORANGE BLOSSOM 2>,3 



ORDERS IN LIVING THINGS 417 



ORGAN (L. organum, an implement) . 46 



Balancing 324 



Of equilibrium 324 



Floral 243 



ORGANIC, definition of 94 



Pertaining to living organisms. 



ORGANISM, definition of 109, 120 



ORIGIN OF MUSCLE 78 



Of species 404 



ORNITHOLOGIST, or'mthol'ojist (G. 



ornis, bird + logos, discourse) 420 



A student of birds. 

 ORTHOGENESIS, or'thojen'esis (G. 

 orthos, straight; genesis, descent), 



definition of 405 



ORT HONOECTIDAE, or'thonek'tiday 

 (G. orthos, straight -f nektys, dead 



body) 307 



ORTMOPTERA, orthop'tera (G. orthos, 



straight; pteron, wing) 335, 425 



An order of Orthopteroidea. 

 ORTHOPTEROIDEA, orthop'teroid'ea . 425 



A sub-class of Pterygogenea. 

 OiSMO'SIS, osmo'sis (G. othein, to 



push) 38 



OSSICLES, os'sicles (L. dimin. of os. 



bone) 319 



OSSIFICATION, os'sifika'shun (L. os 



+ flo, to become ) 74 



OSTEOBLASTS, Osteoblasts (G. osteon. 



bone + blastos, a bud) 113 



Primitive bone cells. 



OSTIA, ostia (L. ostium, a door) 340 



OSTRACODA, ostrako'da (G. ostrako- 



das, like a shell) 424 



A sub-cla>s of Crustacea. 



OTIC, o'tik (G. ous. ear) 73 



OTOCYST, 0'tosist (G. OUS, ear + 

 kystis, bladder) , definition of 324 



