INDEX AND GLOSSARY 



45 



Plants, classification of, 364 



Plas'ma (TrAacr/xa, anything moulded), of 



blood, 56 

 Plasmo'dium (TrAao-yaa, any thing moulded), 



52-55 : comparison of with zygote, 54 

 Plastic (TrAeun-iAcos, formed by moulding) 



products, products of katabolism which 



remain an integral part of the organism, 



Pod'omere (TTOV'S, a foot : /ixepos, a part), a 

 limb-segment, 314 



Polar cells, formation of, 262 



Pollen grain (pollen, fine flour), a name 

 given to the microscope of Phanero- 

 gams. 



Pollen-sac, a name given to the microspo- 

 rangium of Phanerogams. 



Pollen-tube, 376, 383 



Pollina'tion, 376, 383 



POLYGORD'IUS (TroAvs, many : TopSios, 

 King of Phrygia, inventor of the Gordian 

 knot) : Figures, 272, 274, 285, 287, 294, 

 296, 298, 300, 303 : occurrence and gene- 

 ral characters, 271, 274 : metameric seg- 

 mentation, 271-273 : mode of feeding, 

 273 : enteric canal, 273, 277 ; cell-layers, 

 276-278 ; ccclome, 273, 277 : distribution 

 of food, 281 ; blood-system, 282 : nephri- 

 dia, 284 : nervous system, 286 : differen- 

 tiation of definite organs and tissues, 

 291 : reproduction, 293 : development and 

 metamorphosis, 299-306 



Polymorphism (TroAvs, many : MP<W, 

 form), existing under many forms, 251 



Pol'yplast (rroAi)?, many: TrAaerros, formed, 

 modelled), the multicellular stage of the 

 embyro before the differentiation of cell- 

 layers or organs : Hydroids, 248 : Moss, 

 337 : Fern, 359 



PORPITA (TTOPTTYJ, a brooch), 253 : (Figure), 

 253 



Primor'dial utricle, 196, 210 



ProctodaB'um (Trpco/cros, the anus : 6Scuo?, 

 belonging to a way), an ectodermal 

 pouch which unites with the enteron and 

 forms the posterior end of the enteric 

 canal, its external aperture being the 

 permanent anus, 298 



Pro-embryo, chara, 219 (Figure) 



Pro-nucleus, female, 262 : male, 263 : 



conjugation of male and female, 263 

 Pl'OStom'ium (Trpo, before : (TTOjuiov, a little 

 mouth), the first or pre-oral segment in 

 worms, Sic., 271, 296 



PROT'AMCEBA (n-pwros, first : a/uoi/Sos, 

 changing), 9 (Figure). 



Prothal'lus (n-po, before : 0aAA6?, a twig), 

 the gamobium of vascular plants : Fern 

 355 : dimorphism of in Equisetum, 367 

 reduction of in Salvinia, 369 ; Selagi 

 nella, 371, and Gymnosperms, 376, 378 

 retarded development of in Angiosperms 



ProthallUS, secondary, Selaginella, 371 



Prot'eidS (n-pwro?, first), composition of, 5 

 ProtiSt'a (7rpum<rros, the first of all), the 

 lowest organisms intermediate between 

 the lowest undoubted animals and plants, 

 182 

 ProtOCOC'CUS (7rpo)TO?, first : KOKKOS, berry). 



See Haematococcus. 



PROTOMYX'A OU.PCOTOS, first :/nva, mucus): 



Figure, 50 : occurrence and general cha- 



acters, 49 : life-history, 51 ; animal or 



plant? 181 



Protonem'a(7rpaTOS, first : i>rj/u,a, a thread), 



Moss, 336, 339 



Prot'oplasm (Trpwros, first : TrAacr/ixa, any- 

 thing moulded), composition of, 5 : pro- 

 perties of, 5-7 : micro-chemical tests for, 

 7, 8 : minute structure of, 62, 63 : con- 

 tinuity of in Fern. 350 : in Polygordius, 

 292 : intra- and extra-capsular, Kadio- 

 laria, 152 



Protozoa, the, 308 



Proximal (proximus. nearest), the end 

 nearest the point of attachment or or- 

 ganic base, e.g. in the stalk of Vorticella, 

 126 



Pseud'opod 1 (vl/evSrjs, false : TTOVS, foot), 

 described, 4: comparison of with cilium, 

 34, 52 : in columnar epithelium, 59 : in 

 endoderm cells of Hydra, 231 

 Pteris. See Ferns. 

 Punctum vegetationis. See Growing 



point. 



Putrefac'tidn(/?/6-/Y7, to make rotten) 

 nature of, 82 : a process of fermentation, 

 91 : conditions of temperature, moisture, 

 &c., 93, 94 



Putres'cent (putresco, to grow rotten) 

 Solution, characters of, 37, 82 



Putres'cible infusion, sterilization of, 99- 



IO2 



Pyren'oid (n-upryi/, the stone of stone-fruit : 

 elSos, form), a small mass of pr^teid 

 material invested by starch, 27 



Radial symmetry, starfish, 309 



RADIOLAR'IA (radius, a spoke or ray): 

 Figures, 152, 153 : occurrence and general 

 characters, 152 : central capsule, 152 : 

 intra- and extra-capsular protoplasm, 

 152 : silicious skeleton, 152 : symbiotic 

 relations with Zooxanthella, 154 



Rect'UUl (intestinum rectum, the straight 

 gut), the posterior or anal division of the 

 enteric canal, 281 



Redi, Francisco (Italian savant}, experi- 

 ments on biogenesis, 97 



Reducing division, 257, 262 

 Reflex action, 289 

 Reproduction, necessity for, 19 

 Reproductive organ. See Gonad. 



