Students of science who are not biologists must often be confused bythe constant discussions of evolution which now distract attentionrather than define truth, and they will, therefore, be duly grateful toProf. L. W. MacBride, F.R.S., for his very capable summary ofpresent knowledge and theory, under the heading given above(Nature, January 10 and 19, 1925, pages 52 and 89).
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