INDEX 



201 



Phagocytes, 109, 1G7 



Phalanger, 74 



Phosphorescence of sea, 135, 14G 



greatest in July, 151 

 Phosphorus, in protein, 9 



in protoplasm, 41 

 Photo-synthesis, 31, 50, 93 

 Phyllopoda, 187 

 Phylloxera, 188 

 Phytoplankton, 26 

 Picrines, 36 

 Pig, food of, 79 

 Pigment cells, rhythm in, 135 

 Pigments, animal, 36 

 Pilchard, young of, 67 

 Pituitary body, 190 

 Plaice, food of, 67 

 Plankton, 151, 153 

 Planorbis, 107 

 Plant-cells, 17 

 Plant lice, 63 



reproduction of, 188 

 Plantain, seeds of, 175 

 Plantain-eaters, 36 

 Plasma, 107, 110 

 Platanus orie.ntalis, 51 (fig. 14) 

 Plover, American Golden, migration 



of, 129-30 

 Pluteus, 190 

 Pollen sac, 172 

 Pollen tube, 174 

 Polychaeta, 59 

 Poly podium vulgare, 171 

 Pontecypris, 184 

 Pore-space, 44 

 Pores, ambulacra!, 105 

 Porpoises, 76 

 Potassium, in protein, 9 



in protoplasm, 41 

 Potato "eyes," 163 

 Prairie dog, 47 

 Proteins, composition of,7, 9, 29, 36, 89 



molecules of, 8 



m plants, 29, 37 



in animal food, 56, 58 



insoluble in water, 90 

 Prothallus, 171, 174 

 Protophytes, 166, 167 

 Protoplasm, defined, 2 



motile character of, 3 



constitution of, 7 



characteristic of, 36 



Protoplasm {continved) 



cycle, 41 



oxidation of, 100 

 Protoplasmic egg, 183 

 Protozoa, 45, 59, 142 



immortal, lf)6, 167 

 Pseudoinonas, 38 

 Pseudopodia, 10, 11, 12, 122, 123 

 Pteropoda, 76, 178 

 Pupae, shrinkage of, 65 



Rabbit, 81 



Radiolarians, 178 

 Radish, seeds of, 175 

 Rat, 81 



fed on food lacking Vitamin A, 04 

 Red Indians, 96 

 Red Sea, 141 

 Reindeer, food of, 79 

 Reproduction, of protoplasm, 5, 12 



when limit of growth is reached, 160 



vegetative, 162, 164 

 Reptilia, eggs of, 181 

 Respiration, 33, 92 



of plants, 99-101 



of insects, 103 

 Respiratory action of protoplasm, 4 



organs in animals, 101-5 



essential feature of, 103 

 Reticulate sap vessels, 51 

 Retractor bulbi, 68 

 Rhinoceros, destroys vegetation. 79 

 Rhizocephala, change of sex, 185 

 Rhizome, 115, 116 

 Rhythm, 5, 6, 133-59 



in cells, 134-6 



in tissues, 136-8 



in organs, 138 

 Rickets, how cured, 93 

 Rings, annual, 13(), 138 

 Rodents, food of, 81 

 Root- hairs, 48 

 Root pressure, 52 

 Rose, buds of, 163 



reproduction of, 187 

 Rotifers, 16 



parthenogenetic, 187 

 Roundworms, i\>»/«^o(/a, 46, 47, 113 



movement of, 123-4 



spermatozoa of, 184 



sexual condition, 18G 



