280 



INDEX 



Si ze Continued 



of nerve cells, 67 

 Skeleton in old age, i o 

 Skin, death of, 36, 71 

 Sobotta, 145 

 Soldiers, stature of, xiii 

 Spallanzani, 197 



foot-note, 198 

 Specification defined, 45 

 Spencer, Herbert, 234 

 Spinal cord, embryonic, 50 

 Spirogyra, 184 

 Stature decreases with age, 2 



of Germans, 2 



of soldiers, xiii 

 Steele, M. I., 210 

 Stentor, 141, 142, 199 

 Stevens, Miss (foot-note), 211 

 Stomach, self-digestion, 72 

 Struggles of tissues, 32 

 Syncytium, 43, 150 



in embryos, 44 



Tadpoles, growth of, 88 



regeneration in, 198 



tails of, 83 

 Tails of tadpoles, 83 

 Tanner, Amy E. (foot-note), 237 

 Tarsius, 162 

 Teeth, 82 



Teleological mechanism, 20 

 Temperature influences growth , 



88 



Theory of germinal continuity, 

 '83 



of life, viii, 265 

 Thoma, 115, 116 

 Thymus, 82 

 Tigroid substance, 54 

 Tissier (foot-note), 27 

 Tissues, struggles of, 32 

 Tortoises, longevity of, 264 

 Trembley, 197, 198 

 Trypanosoma, 140 

 Tumours, 206 



growth of, 224 



V 



Variation and ability, 246 

 Vertebral column in old age, 2 

 Vital force, vii, viii 

 Volkmann (foot-note), 204 



W 



Waldeyer (foot-note), 203 

 Weidenreich (foot-note), 76, 77, 79 

 Weismann, A. (foot-note), 226 



on life units, 235 

 Whales, longevity of, 264 

 Whitman, 235 

 Woods, F. A., 1 80 



Yolk granules, 195 

 Z 



Ziegler, Ernst, figure after, 202 

 foot-note, 204 



