INDEX 



275 



Senescence, 27-30, 46, 70-78 



theories of, 43-50 

 Senile changes in nerve cells, 27-29 

 Senility as cause of death, 109 



in plants, 44, 74, 75 

 Septiccemia, 231, 232 

 Serbia, 252, 253 

 Serum, influence on tissue culture, 



76, 77 

 Sex organs, 107, 108, 111, 121-125, 



217-219 

 Sexual reproduction, 37-41 

 Shell, J., 26, 27 

 Skeletal system, 107, 108, 112, 127, 



128 

 Skin, 107, 108, 110, 112, 131, 132 

 Slonaker, J. R., 212, 213, 218, 228, 



267 

 Slotopolski, B., 33, 267 

 Snow, E. C, 179-183, 225, 267 

 Softening of the brain, 231, 232 

 Soma, 40 



Somatic cells, immortality of, 58-78 

 Span, 174, 175 

 Spiegelberg, W., 87 

 Spiritualism, 18-20 

 Spleen, 61 

 Sponges, 62 

 Stature, 174, 175 

 Steinach, B., 217-219, 267 

 Stenostomum, 35, 36 

 Stevenson, T. H. C, 206-208, 267 

 Still births, 205 

 Strongylocentrotus purpuratus, 55, 



56 

 Summary of results, 223-227 

 Survivorship lines of Drosophila, 



188, 192, 195 

 Syphilis, 123 



Table, life, 79-82 



Temperature, 208-217 



Tethelin, 70, 220-222 



Theories of death, 43-50 



Theory of population growth, 249 



Thyroid gland, 61 



Tissue culture in vitro, 58-78 



Transplantation of tumors, 64, 65 



Tuberculosis, 161, 204, 208, 230, 231, 



238 

 Tumor transplantation, 64, 65 

 Typhoid fever, 230, 231, 235, 230 



United States, growth of, 250-252, 



254-257 

 Vrostyla grcmdis, 72 



Van Buren, G. H., 113, 260 

 Variation, genetic, 190 

 Venereal diseases, 123, 124 

 Verhulst, P. ¥., 249, 267 

 Verworn, M., 44, 267 

 Vienna, 245, 246 

 Voronoff, 217 



Waller, A. D., 216, 267 



Walworth, E. H., 152, 267 



War, 243 



Wedekind, 33, 267 



Weismann, A., 26, 43, 65, 267 



Whale, longevity of, 22 



Wilson, H. v., 62, 267 



Wittstein, 99 



Woodruff, L. L., 30, 33, 72, 73, 267, 



268 

 Woods, F. A., 38, 39, 268 



Yellow fever, 240, 242 

 Young, T. E., 23-25, 268 



