INDEX 



279 



Ovum Continued 



human, weight, 128 



volume, 130 

 segmentation of, 162, 163, 



Pancreas, 57, 148 



Pangenesis, 234 



Phagocytes, 26, 74 



Physiological units, 234 



" Pill-bug, " 207 



Planarians, 210 



Planorbis, 172 



Plants, old age in, 34 



Plasmodium, 139 



Polyps, 1 97 



Porter, W. T. (foot-note), 15 



Prevost and Dumas (foot-note), 



172 



Preyer, Wm. (foot-note), 237 

 Protoplasm defined, 41 



differentiation of, 143 



illustrated 132 



increase of, 134 



with age, 156, 157 



problem of its increase, iv 

 Pseudopodia, 138 

 Pulse, changes with age, 15 



in old age, 18 



Quetelet, 109 



Q 



R 



Rabbits, condition at birth, 104 

 embryos, 135 



growth of, 122 

 percentage increments, 



124 



weight of, 124 

 growth of, 1 02 

 growth tables, 251 

 Rabl, Carl (foot-note), 172 

 Rand, Benj. (foot-note), 236 

 Rate of growth, 86 

 defined, 93 

 in chickens, 101 

 in guinea-pigs, 94 

 in man, 98, 106, 108 



in rabbits, 102 



method of representing, 96 

 Redifferentiation, 170 

 Regeneration, 169, 197 



in annelids, 212 



in ascidians, 211 



in Ciona, 211 



in planarians, 210 



in polyps, 197 



in salamanders, 198 



in Stentor, 199 



in tadpoles, 198 



of antenna, 207 



of eye stalks, 210 



of lens from retina, 223 



of muscle, 201 



of nerve fibres, 200 



of skin, 204 



Regulation of growth, 205 

 Rejuvenation caused by nuclei, 

 166 



perpetuation of, 180 



theory of, 166 

 Remy Collin, 178 

 Repair in old age, 20 

 Respiration in old age, 18 

 Retina, 64 



Roberts (foot-note), 112 

 Rovighi, A. (foot-note), 27 

 Rubaschkin, W. (foot-note), 181 



Salamander, 156 



regeneration in, 198 

 Salivary corpuscles (foot-note), 72 

 Schaper and Cohen (foot-note), 



191 



Schmincke (foot-note), 204 

 Schultze, L. S., 211 

 Schwann, Theodor, 39 

 Sclerosis, 15, 30 

 Seals, longevity of, 264 

 Segment, primitive muscular, 220 

 Semper, Carl, 212 

 Senescence, 132, 167 



a vital phenomenon, x 



Hyatt's study of, 225 



in protozoa, 231 

 Sex cells, 181 



Shinn, M. W. (foot-note), 237, 239 

 Size of animals, 65 



of cells, 135, 151 



