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A must read for every biologist as well anyone interested in biological evolution. The Victorian English is a bit stilted but it is understandable, especially on a Kindle Reader that will show the older definitions of obsolete or archaic words. Every reader should remember that when Darwin wrote this, the mechanism of inheritance was not understood, the Mendelian concepts of inheritance were not published for another 10-20 years, the ideas of chromosomes and genes were several more decades in the future, and the work of Watson & Crick identifying DNA as the carrier of genetic information and the mechanism of duplication and change was published in 1953, eighty years after publication of is work!