INDEX. 



'81 



Pollacci, — ., Chlorophyll Assimilation, 606, 



693 

 Pollen, Formation in Hemerocallis, 78 



— in Convallaria and Potamogeton, De- 



velopment, 351 



— of Hybrids, 606 



Pollen-grain in Symplocarpus and Pel- 



tandra, Development, 4S3 

 Pollen-mother-cells of Col>zea scandens, 



Development of Karyokinetic 



Spindle, 685 



of Liliacese, Karyokinesis, 684 



Pollen-tube, Chemotropism, 222 

 Pollock, J. B., Mechanism of Root Curva- 

 ture, 488 

 Polyascomyces g. n., 617 

 Polyembryony, Experimental, 442 

 Polychseta, Nephridia, 673 

 Polychoetes, Regeneration, 54 

 Polyclads of the Pacific Expedition, 63 

 Polydactylism in Poultry, 303 

 Polymorphism in the Chlorophycese, 360 

 Polyphagus euglenx, Zygospores, 212 

 Polyphemidse, Eyes, 51 

 Polypterus and Protopterus, Habits, 312 



— Habits, 1S6 



Polysaccharides of Bacteria, Iodine-Stain- 

 ing, 370 



Polytrema miniaceum, 595 



Polyzoa, Arctic, 587 



Pontederiacese, Crystal-cells, 687 



Popovici, A. P., Influence of External 

 Conditions on the Length of the Grow- 

 ing Zone, 353 



Porchet, F., Influence of Copper Salts on 

 Plants, 486 



Pores and Chambers in the Cell-wall of 

 Diatoms, 360 



— Apical, of the Leaves of Aquatic Plants, 



347 



— of Diatoms, 613 

 Porifera. See Contents, xx 

 Poronia punctata, Biology, 617 



Porter, C, Bacteriology of Typhus Fever, 



245 

 Posternak, S., First Organisation-product 



of Phosphoric Acid, 60S 

 Potassium, Absorption by Plants, 352 

 Potter, M. C., Parasitic Fungus, 494 

 Poulton, Ei. B., Colour-Variation in Pupte, 



197 

 Powell's, Hugh, Microscopes, 282 

 Poynton, F. J., Diplococcus of Rheumatic 



Fever, 710 

 Pratt, H. S., North American Heterocoty- 



lea, 676 

 Preda, A., Movements in Bornetia secundi- 



flora, 359, 700 

 Premnodrilus g. n., 584 

 Preparing Objects. See Contents, xxxvii 

 Preservative Fluids. See Contents, xxxviii 

 President, The, 141, 144, 150, 151, 268, 



411, 535, 738, 739, 740, 742 



Dec. 19th, 1900 



President, The, On the Structure of some 



Paleozoic Plants, 533 

 Standard Sizes for Eye-pieces and 



Substage Fittings, 141 

 President's Address, 153 

 Pressure, Diminished, Effects on the 

 Growth of Plants, 485 



— Increased, Effect on Chlorophyll As- 



similation, 693 

 Prillieux, E., Parasitic Fungi, 235, 363 

 Primula obconica and sinensis, Pathogenic 



Effects, 598 

 Projection Apparatus, Reichert's Large, 

 252 



Medium, 253 



New, 120 



Zeiss', 383 



— Arc-Lamp, Zeiss', 381 



— Eye-piece, New, and an Improved 



Polarising Eye-piece, 537 



— Photomicrography and Drawing, 



Reichert's New Combined Appara- 

 tus, 122 

 Proliferations, Epidermic, on a Whale, 306 

 Propagation, "Vegetative, of Erythronium, 



694 

 Proteids, Formation in the Dark, 85 

 in Germinating Wheat, 354 



— insoluble in the Gastric Juice, Produc- 



tion, 85 



— of Plants, 685 



Proteinaceous Substances in Seeds, 478 

 Proteolysis in Aspergillus niger, 494, 704 

 Proteolytic Diastase of Malt, 599 



— Enzyme, Alleged, of Nepenthes, 479 



in Seeds after Germination, 599 



Proteosoma and Mosquito, 595 

 Proteus vulgaris, Serum Reaction, 474 

 Protophyta. See Contents, xxxi 

 Protoplasm, Living, Alleged Occurrence 



in the Air-Passages of Water-plants, 

 597 



— of Plants. See Contents, xxii 

 Protopterus and Polypterus, Habits, 312 



— Genera, 459 



Protozoa. See Contents, xx 



— of Rice-fields, 680 



— Reactions, 592 



— Studies on, 592 

 Protracheata. See Contents, xvi 

 Provasek, S., Synedra hyalina sp. n., a New 



Non-chlorophyllous Diatom, 614 

 Prowazek, S., Cell Studies, 447 



— Conjugation in Infusoria, 70 



— Cyst-formation in Protozoa, 210 



— River Plankton, 314 



— Structure and Development of Collem- 



bola, 580 



— Studies on Protozoa, 592 

 Pruvot, G., Two Neomenians, 317 

 Pseudactinomycosis and Actinomycosis, 95 

 Pseudindican and Indican, 214 

 Pseudo-diphtheria Bacilli, Varieties, 712 



3 a 



