/\ l>i:\ 



H" 



Phylloxera (aphid), -'Us. 357, 364 

 Phy8a (snail), 276 

 Physiological units, 18, 398 

 Physiology of fertilization. 284 ff. 



of sex, 369 #. 

 Physostegia (angiosperm), 176, 225 

 Phi/teh phus (angiosperm >, 46 

 Picard, 147. 230 

 Pictet, .",i 



Pieris (butterfly), 61, 21 1 

 Pig, chromosomes, 165, 301 

 Pigcera (butterfly). , _ > .7_* 

 Pigeons, sex-determination, 369, 376 

 Pigments. 104. 105, 122. 13."). 136 

 Pilobolus (fungus), 187 

 Pinguiada (angiosperm), 158 

 Pinney, 159 



Pinnotheres (crustacean), 274 

 Pin us (pine), cell plate, 176 



rhondriosomes, 121, 122 



fertilization, 294, 295 



protoplasmic connections, 46 



reduction, 239 

 Pisciola (leech), 178 

 Pisum (pea), 61, 121, 122, 249, 256, 34* 



linkage in, 378, 384 

 Pits. 28, 191, 192 

 Pin a aria (flat worm), 139, 237 

 Plantago (angiosperm), 372 

 Plasma membrane, 25, 42 

 Plasmahaut. 42 



Plasmatic microsomes, 205, 200 

 Plasmodermal blepharoplast, 95, 97 

 Plasmodesmen, 46 

 Plasmodium (protozoan), 317 

 Plasmogamy, 292 

 Plasmosome, 25, 65 

 Plastid, 26, 103 ff. 



individuality of, 113 



inheritance, 331-334 



primordia, 115, 122, 124. 332, 

 333 

 Plastidome, 122 

 Plastidule, L8 

 Plastochondria, 1 18, 121 

 Plough, 395 



Plumbaqella (angiosperm), 225 

 Podocarpu8 (conifer), 213 



Podophyllum (angiosperm ». 1 .">'.», 231 1 



Point mutation, 351 



Polar bodies, 15, 221, 275, 276 



in parthenogenesis, 318, 319, 364 

 Polar nuclei, 299, 300, 301 



Polarity, L38jf. 329, 334 



PoHanthet (angiosperm , 110 



Polioplasm, 12 



Politis, 110 



Pollen grain uall. r.ti; 



tube, 294, 298, 299 

 Polygon* lla (angiospei m . 25 

 Polypodium fern . 236 

 Polysiphonia (red alga . centrosph 

 79, 80 



fertilization. 289 



reduction, 223, 236 

 PolysHchum (fern I, 316, :;i7 

 Polystigma (fungus), 291 

 Polytoma (green alga), 83, 84 

 Polytomella (green alga . 

 Polytrichum (mo- . 88, 89, 221 

 Popoff, 120, 259 

 Porella (liverwort), 87 

 Postreduction, 245, 248 

 Potato starch. 107 

 Pratt and Long. 237 

 Preformation theory. :; 

 Preissia (liverwort), 82, 293 

 Prenant, 184, 185 

 Prereduction, 245, 2 1s 

 Prevost and Dumas, 14, 15 

 Primaniypus, 245 



Primula (primrose), 239. 248, 346, 391 

 Pringsheim, 14, 311 

 Prionidus (bug), 359, 360 

 Pritchard, 372 

 Prochromosomes, 158, 159 

 Progamic sex-determination. 357 

 Promitosis, Jus 



Promorphology of ovum, 328 jf. 

 Pronucleus, 275, 276, 277 

 Prophase, somatic. 144, 11."). 150 153 



heterotypic, 231 ff. 

 Protandry, 371 

 Protein, 39, 40. .".1. 134 



crystals, 135 

 Protenor (bug . 360 

 Prothallial auclei, 294 

 Protokaryon, 68 

 Protoplasm, chemical uatui r . 50 



colloidal nature. .", I ff. t ."» 1 

 doctrine, 1 I 



early obeerval ions, 6, 32 ff. 

 physical properties, 32 

 senescence, 136 

 structural theori< 

 substratum of life, 32, I s .//". 



