INDEX AND GLOSSARY 



405 



Plants, classification of, 364 



Plas'ma (-n-Xda-^a., anything moulded), of 



blood, 56 

 Plasmo'dium (irAao>ia,anything moulded), 



52-55 : comparison of with zygote, 54 

 Plastic (TrAacrTiKOS, formed by moulding) 



products, products of katabolism which 



remain an integral part of the organism, 



1 1 

 jj 



Pod'omere (TTOV?, a foot : /ue'pos, 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 (VoAv?, many : TopStos, 

 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 ; ccelome, 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 (TTOAVS, many : /aopt^rj, 



form), existing under many forms, 251 

 Pol'yplast (TroAv?, many: TrAacrro?, formed, 

 modelled), the multicellular stage of the 

 embyro before the differentiation of cell- 

 layers or organs : Hydroids, 248 : Moss, 

 337 : Fern, 359 

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



Primor'dial utricle, 196, 210 

 Proctodae'um (n-puKTos, the anus : oS 

 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 

 PrOStom'ium (npo, before : O-TO/JHOV, a little 



mouth), the first or pre-oral segment in 



worms, c., 271, 296 

 PROT'AMCEBA (n-pwro?, first : <i|u.oi/36s, 



changing), 9 (Figure). 

 Prothal'luS (npo, before : 0aAAd?, 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, 



384 

 Prothallus, secondary, Selaginella, 371 



Prot'eids (Trpciros, first), composition of, 5 



ProtiSt'a (^pomo-To?, the first of all), the 

 lowest organisms intermediate between 

 the lowest undoubted animals and plants, 

 182 



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

 See Hsematococcus. 



PROTOMYXA (/upd>To?, first: /xva,mucus): 

 Figure, 50 : occurrence and general cha- 

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

 plant? 181 



Protonem'a(7rpd)Tos, first : VT}/IAOI, a thread), 

 Moss, 336, 339 _ 



Prot'oplasm (Trpwros, first : TrAacr/xa, 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, Radio- 

 laria, 152 



Protozoa, the, 308 



Prox'imal (proximns, nearest), the end 

 nearest the point of attachment or or- 

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

 126 



Pseud'opod] (v//evS>js, 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. 



Pv&TGfa'tion(#utrefacz0, to make rotten) 

 nature of, 82 : a process of fermentation, 

 91 : conditions of temperature, moisture, 



& c -> 93> 94 



Putres cent (ftutresco, to grow rotten) 

 solution, characters of, 37, 82 



Putres cible infusion, sterilization of, 99- 



IO2 



Pyren'oid (trvpriv, the stone of stone-fruit : 

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

 material invested by starch, 27 



R 



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'um (intestinum rectum, the straight 

 gut), the posterior or anal division of the 

 enteric canal, 281 



Redi, Francisco (Italian sa-'attt), experi- 

 ments on biogenesis, 97 



Reducing division, 257, 262 



Reflex action, 289 



Reproduction, necessity for, 19 



Reproductive organ. See Gonacl. 



