Charles Darwin On the Races of Man

After reading Darwin's "Chapter 7: On the Races of Man" from The Descendant of Man there are a few key points that he attempts to convey:

• Differences within the existing races of man such as skin color, hair color, shape of skull, body proportions, etc., do exist, however, in comparison the the structure of the human body as a whole, man is very similar
• Various races have similar inventive or mental powers
• Evidence:
• stone arrowheads from different parts of the world are almost identical
• various simple beliefs and customs are the same or similar
• Naturalists observe such similarities as these and argue that natural forms are descended from a common "progenitor", and the same argument can be applied to the races of man
• The physical spread of man lead do diversity in character
• diversity such as:
• language
• arts
• Natural selection may be responsible for developing differences and some preservation of similarity in man:
• arguments proven wrong:
• external characteristic differences: discussed above
• the effects of the continued use of parts: effects of te increased or decreased use of parts (body parts, etc.)
• principle of correlation: correlating development such as skin and hair or muscular development and strongly projecting supra-orbital ridges