404 



INDEX AND GLOSSARY 



name frequently applied to the oosperm 

 of plants. 



OPALIN'A (from its opalescent appear- 

 ance) : Figure, 120: occurrence and 

 general characters, 119-121 : structure 

 and division of nuclei, 119: parasitic 

 nutrition, 121 : reproduction, 122 : means 

 of dispersal, 122 : development, 123 



Optimum (pptimus, best) temperature for 

 amoeboid movements, 21 : for sapro- 

 phytic monads, 40 



Organ (opyavov, an instrument), a portion 

 of the body set apart for the perform- 

 ance of a particular function, 287 



Or'ganism, any living thing, whether 

 animal or plant, 5 



Ossicle (diminutive of os, a bone), 308 



Ov'ary (dvmii), an egg), the female gonad 

 or ovum-producing organ ; see under the 

 various types and especially Vaucheria, 

 170 : atrophy of, in Angiosperms, 378. 

 The name is also incorrectly applied to 

 the venter of the pistil of Angiosperms, 



377 



Ovi'duct (ovuni, an egg : duco, to lead), 

 a tube conveying the ova from the ovary 

 to the exterior, 291 



Ov'um (ovum, an egg), the female or 

 megagamete in its highest stage of dif- 

 ferentiation : general structure of, 68, 

 69 : minute structure and maturation of, 

 2 54> 255 : see also under the various 

 types and especially Vaucheria, 170 : 

 formation of, in Angiosperms, 379 



Ov'ule (diminutive of ovum\ the name 

 usually applied to the megasporangium 

 of Phanerogams. 



Oxidation of protoplasm, 15 



OXYTRICH A (ofus, sharp : 0pi, a hair), 

 1 17 (Figure) 



Pancreas (Trayxpeas, sweetbread), 325 

 Param'ylum (Trapa, beside : a^vAoi/, fine 



meal, starch), 46 

 PARAM(E'CIUM : Figures, 106, 112: 



structure, 104: mode of feeding, no: 



asexual reproduction, 112: conjugation, 



112 



Para'nucleus (beside the nucleus), 109 

 Par'asite, parasitism (Trapao-Zros, one 



who lives at another's table) : Opalina, 

 121 : Bacteria, 91 : Mucor, 165 

 Paren'chyma (Trape'yxuMa.anything poured 

 in beside, a word originally used to de- 

 scribe the substance of the lungs, liver, 

 and other soft internal organs), applied 

 to the cells of plants the length of which 

 does not greatly exceed their bread tli 

 and which have soft non-liguified walls, 

 60 : ground-parenchyma, 343. 344 



Pari'etal (paries, a wall), applied to the 

 layer of ccelomic epithelium lining the 

 body-wall, 273, 274 



Parthenogen'esis (TrapfleVo?, a virgin : 



yeVecri?, origin), development from an 



unfertilized ovum or other female 



gamete, 198 

 Parthenogenet'ic ova, characteristics of, 



258 

 Pasteur, Louis, researches on yeast, 77- 



79 



Pasteur's solution, composition of, 77-79 

 Pedal (pes, the foot) ganglion, Mussel, 



3i9 



PENICILL'IUM (pcnicillnm, a painter's 

 brush from the form of the fully-deve- 

 loped aerial hypha;) : Figure, 184: oc- 

 currence and general characters, 182: 

 mode of growth, 183: microscopic 

 structure, 183 : formation and germina- 

 tion of spores, 187, 188 : sexual repro- 

 duction, 188 : nutrition, 188 : vitality of 

 spores, 189 



Pepsin (TreTTTw, to digest), the proteolytic 

 or peptonizing ferment of the gastric 

 juice, 12, 79 



Peptones, 12 



Perianth (n-ept, around : av9os, a flower), 

 the proximal infertile leaves of a flower, 



37.7 



Perisperm (rrepi, around : o-rrep/^a, seed), 

 nutrient tissue developed in the nucleus 

 of the seed, 376 (description of figure) 



Peristom'e (irept, around ; oro/ma, the 

 mouth), Vorticella, 126 



Peristomlum (jrepi, around : oro/ouoi/, a 

 little mouth), the mouth-bearing segment 

 of worms, 267, 293 



Peritone'um (Tre'pn-ovcuoi/), the membrane 

 covering the viscera, 321 



Pet'alS (fl-e'TaAof, a leaf), the inner or dis- 

 tal perianth leaves in the flower of 

 Angiosperms, 377 



Phar'ynx (</>apu-y, the throat) : Poly- 

 gordius, 276 : Dogfish, 324 



Phloem ($A.<HOS, bark or bast), the outer 

 portion of a vascular bundle, 345 



Phyla ((f>OA.ov, a tribe) of the animal king- 

 dom, 303 : of the vegetable kingdom, 

 360 



Phyll'ula (diminutive of <frv\\ov, a leaf), 

 the stage in the embryo of vascular 

 plants at which the first leaf and root 

 have appeared, 356 : contrasted with 

 gastrula, 356 



PhylOg'eny (<f>vXoi^, a race : ytVto-ts, 

 origin), the development of the race, 

 144 



Physiol'Ogy ($u<ns, the nature or property 

 of a thing : Aoyos, a discussion), the de- 

 partment of biology which treats of 

 function, 9 ct seq. 



Pigment-spot, Euglena, 47 . 



