Chapter 4.6-4.11

Chapter Ⅳ: Natural Selection; Or The Survival Of The Fittest
4.6 Extinction Caused By Natural Selection ---- 00:00 
4.7 Divergence Of Character ---- 04:02
4.8 The Probable Effects Of The Action Of Natural Selection Through Divergence Of Character And Extinction, On The Descendants Of A Common Ancestor ---- 16:47
4.9 On The Degree To Which Organisation Tends To Advance ---- 40:17
4.10 Convergence Of Character ---- 51:59
4.11 Summary Of Chapter ---- 58:39