Species and Varieties, Their Origin by Mutation
Species and Varieties, Their Origin by Mutation
Book Excerpt
798
Conclusions. Specific and intra-specific selection. Natural
selection in the field. Acclimatization. Improvement-selection of
sugar-beets by various methods. Rye. Hereditary percentage and
centgener power as marks by which intraspecific selection may be
guided.
Index 827
[1] A. INTRODUCTION
LECTURE I
DESCENT: THEORIES OF EVOLUTION AND METHODS OF INVESTIGATION
Newton convinced his contemporaries that natural laws rule the whole universe. Lyell showed, by his principle of slow and gradual evolution, that natural laws have reigned since the beginning of time. To Darwin we owe the almost universal acceptance of the theory of descent.
This doctrine is one of the most noted landmarks in the advance of science. It teaches the validity of natural laws of life in its broadest sense, and crowns the philosophy founded by Newton and Lyell.
Lamarck proposed the hypothesis of a common origin of all living beings and th
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