UNDER the title “Perigenesis der Plastidule oder die Wellenzeugung der Lebenstheilchen,” Prof. Haeckel has published quite recently a pamphlet containing an attempt to furnish a mechanical explanation ...
Charles Darwin’s theory of evolution by natural selection requires both a source of heritable variation and a mechanism by which this variation is inherited. Darwin had been developing his ideas on ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results