Chapter 2.1-2.7

Chapter Ⅱ: Variation Under Nature
1.1 Variability ---- 00:00
1.2 Individual Differences ---- 04:28
1.3 Doubtful Species ---- 11:59
1.4 Wide-Ranging, Much Diffused, And Common Species Vary Most ---- 32:59
1.5 Species Of The Larger Genera In Each Country Vary More Frequently Than The Species Of The Smaller Genera ---- 37:17
1.6 Many Of The Species Included Within The Larger Genera Resemble Varieties In Being Very Closely, But Unequally, Related To Each Other, And In Having Restricted Ranges ---- 42:54
1.7 Summary ---- 47:56