INDEX 



275 



Senescence, 27-30, 46, 70-7-S Table., life., 70-82 



theories of, 43-50 Temperature, 208-217 



Senile changes in nerve cells, 27-29 Tethelin, 70, 220-222 



Senility as cause of death, 109 Theories of death, 43-50 



in plants, 44, 74, 75 Theory of population growth, 249 



Septicaemia, 231, 232 Thyroid gland, 61 



Serbia, 252, 253 Tissue culture in vitro, 58-78 



Serum, influence on tissue culture, Transplantation of tumors, 64, 65 



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



238 



Tumor transplantation, 64, 65 

 Typhoid fever, 230, 231, 235, 230 



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, United States, growth of, 250-252. 



128 254-257 



Skin. 107, 108, 110, 112, 131, 132 Urostyla grandis, 72 



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 



Van Buren, G. H., 113, 260 

 Variation, genetic, 190 

 Venereal diseases, 123, 124 

 Verhulst, P. F., 249, 267 

 Verworn, M., 44, 267 



Somatic cells, immortality of, 58-78 Vienna, 245, 246 



Span, 174, 175 



Spiegelberg, W., 87 



Spiritualism, 18-20 



Spleen, 61 



Sponges, 62 



Stature, 174, 175 



Steinach, E., 217-219, 267 



Stenostotmim, 35, 36 



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



Still births, 205 



Voronoff, 217 



Waller, A. D., 216, 267 

 Walworth, R. 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 



Strongylocentrotus purpuratus, 55, Woodruff, L. L., 30, 33, 72, 73, 267, 



56 



Summary of results, 223-227 

 Survivorship lines of Drosophila, 



188, 192, 195 

 Syphilis, 123 



268 

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



Yellow fever, 240, 242 

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



