Chapter Ⅳ: Natural Selection; Or The Survival Of The Fittest
4.1 ---- 00:00
4.2 Sexual Selection ---- 21:48
4.3 Illustrations Of The Action Of Natural Selection, Or The Survival Of The Fittest ---- 27:48
4.4 On The Intercrossing Of Individuals ---- 47:00
4.5 Circumstances Favourable For The Production Of New Forms Through Natural Selection ---- 60:35
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