INDEX 



445 



Phylloxera (aphid), 318, 357, 364 

 Physa (snail), 276 

 Physiological units, 48, 398 

 Physiology of fertilization, 284 ff. 



of sex, 369 ff. 



Physostegia (angiosperm), 176, 225 

 Phytelephas (angiosperm), 46 

 Picard, 147, 230 

 Pictet, 51 



Pieris (butterfly), 61, 211 

 Pig, chromosomes, 165, 361 

 Pigcera (butterfly), 252 

 Pigeons, sex-determination, 369, 376 

 Pigments, 104, 105, 122, 135, 136 

 Pilobolus (fungus), 187 

 Pinguicula (angiosperm), 158 

 Pinney, 159 



Pinnotheres (crustacean), 274 

 Pinus (pine), cell plate, 176 



chondriosomes, 121, 122 



fertilization, 294, 295 



protoplasmic connections, 46 



reduction, 239 

 Pisdola (leech), 178 

 Pisum (pea), 61, 121, 122, 249, 256, 348 



linkage in, 378, 384 

 Pits, 28, 191, 192 

 Planaria (flatworm), 139, 237 

 Plantago (angiosperm), 372 

 Plasma membrane, 25, 42 

 Plasmahaut, 42 



Plasmatic microsomes, 206, 206 

 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, 48 

 Plastochondria, 118, 121 

 Plough, 395 



Plumbagella (angiosperm), 225 

 Podocarpus (conifer), 213 

 Podophyllum (angiosperm), 159, 239 

 Point mutation, 351 

 Polar bodies, 15, 221, 275, 276 



in parthenogenesis, 318, 319, 364 

 Polar nuclei, 299, 300, 301 



Polarity, 138 ff., 329, 334 



Polianthes (angiosperm), 110 



Polioplasm, 42 



Politis, 110 



Pollen grain wall, 196 



tube, 294, 298, 299 

 Polygonella (angiosperm), 25 

 Polypodium (fern), 236 

 Polysiphonia (red alga), centrospheres, 

 79, 80 



fertilization, 289 



reduction, 223, 236 

 Polystichum (fern), 316, 317 

 Poly stigma (fungus), 291 

 Polytoma (green alga), 83, 84 

 Polytomella (green alga), 83 

 Polytrichum (moss), 88, 89, 224 

 Popoff, 120, 259 

 Porella (liverwort), 87 

 Postreduction, 245, 248 

 Potato starch, 107 

 Pratt and Long, 237 

 Preformation theory, 3 

 Preissia (liverwort), 82, 293 

 Prenant, 184, 185 

 Prereduction, 245, 248 

 Prevost and Dumas, 14, 15 

 Primsertypus, 245 



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

 Pringsheim, 14, 311 

 Prionidus (bug), 359, 360 

 Pritchard, 372 

 Prochromosomes, 158, 159 

 Progamic sex-determination, 357 

 Promitosis, 208 



Promorphology of ovum, 328 ff. 

 Pronucleus, 275, 276, 277 

 Prophase, somatic, 144, 145, 150-153 



heterotypic, 231 ff. 

 Protandry, 371 

 Protein, 39, 40, 51, 134 



crystals, 135 

 Protenor (bug), 360 

 Prothallial nuclei, 294 

 Protokaryon, 68 

 Protoplasm, chemical nature, 39 jf., 50 



colloidal nature, 34 ff., 51 



doctrine, 11 



early observations, 6, 32 ff. 



physical properties, 32 



senescence, 136 



structural theories, 33 



substratum of life, 32, 48 ff. -_. 



