{"date":"September 5","id":"09-05","intro":["Just as the individual has a definite length of life, so have species a limited duration. The progress and transition of the world, Darwin declares, will see the extinction of certain variants of human life."],"minutes":12,"readings":[{"author":"Charles Darwin","end":357,"start":353,"volume":11,"work":"Origin of Species"}],"slug":"september-5","status":"proofread","title":"Survival of the Fittest","url":"/harvard-classics/september-5/","words":2318}