iv CONTENTS. 



Application of Biophysical Research to Medical Problems. By 



G. W. Crile and Hugo Fricke 237 



The Age of the Earth from the Geological Viewpoint. By T. C. 



Chamberlin 247 



The Age of the Earth from the Paleontological Viewpoint. By 



John M. Clarke 272 



The Age of the Earth from the Point of View of Astronomy. 



By Ernest W. Brown 283 



The Radio-Active Point of View. By William Duane 286 



CORRIGENDA. 



Page 84, line 14, for p. 79 read p. 86. 



Page 86, line 9, for p. 91 read p. 98. 



Page 87, line 7, for p. 86 read p. 93. 



Page 93, line 20, for p. 83 read p. 90. 



Page 93, footnote, for p. 80 read p. 87. 



Page 96, line 6, for p. 84 read p. 91. 



Page 96, line 14, for p. 84 read p. 91. 



Page 153, line 2 should be transferred and made line i on p. 152. 



