684 HISTORICAL GEOLOGY 



When it is remembered that man has come up from the cave and 

 the stone hammer in the past 50,000 or 75,000 years, and that in the 

 past 100 years the greatest achievements of science have been accom- 

 plished, so that man to-day lives under conditions radically different 

 from those of his ancestors of a few generations past, it would seem 

 that the evolution which will take place will change profoundly the 

 human race, if not interfered with. The progress of evolution does 

 not, however, have a free course since, as never before in the history 

 of animal life, the unfit do not disappear in the struggle for existence, 

 but the life of the physically and mentally unfit is lengthened through 

 the aid of medical science and charity. The future will, doubtless, 

 bring solution for such vital problems, and the evolution of the 

 human race can confidently be expected to continue, with the develop- 

 ment of a type of man much superior to that now on earth. 



