CURRENT LITERATURE. 
BOOK REVIEWS. 
Evolution and adaptation. 
UNDER THE ABOVE TITLE the author has published a critical exami- 
nation of the current ideas regarding the origin of adaptations.‘ His 
extended work on regeneration showed very plainly the insufficiency of the 
natural-selection theory as an explanation of the phenomena of that field. The 
present work is an extension of the same idea to the whole biological field, 
as the result of a study of the general problem from the same point of view. 
The appearance of De Vries’s Mutationstheorie, and the republication of 
Mendel’s experiments in heredity, with the correlated work of the last three 
to use the author’s words, “while we can profit: 
ably reject much of the theory of natural selection, and more especially the 
idea that adaptations have arisen because of their usefulness, yet the fact 
evolution, The numerous original ideas 
example chosen at random. In the discussion of the recapitulation theory 
the author gives the details of his interesting theory of embryonic repetition, 
MorGan, T. H., Evolution and adaptation, 
Macmillan Co. 1903. 
may be represented by the following 
8vu. pp. xiii+-470. New York: 
66 [ JANUARY 
