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We hope that, if a second edition should appear, drastic changes will be
made in the composition of this atlas, which in its present form is quite un-
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P. D. NIEUWKOOP
"LABORATORY STUDIES OF CHICK AND PIG EMBRYOS"
1955
by R. L. Watterson
Offset print
64 pp Burgess Publishing Company, Minneapolis
Price: $ 2,25
In this manual the anatomy of the 33, 48 and 72 hour chick embryo and of
the 10 mm pig embryo have been treated very accurately in a clear and easily
surveyable form. The development up to the first stage (approx, 12— 15
somites) has been given in a separate chapter. Nevertheless it will be very
difficult for the beginner to understand the enormous step from the unincubated
egg up to the well organized embryo of 12— 15 somites. In the 48 and 72 hour
embryos the general structure of the embryo probably does not change too
much to be understood by the student, but the topography of the various structures
needs, in our opinion, much additional information. It is therefore suggested
that at least one or two stages be inserted before the 33 hour embryo and
that some schematic drawings be added to illustrate the various morphogenetic
events taking place in between the successive stages to be studied.
The presentation of only a single stage in the development of the pig might
be misleading for the students. Although many developmental processes are
comparable between the chick and the pig. the early development of the mammal
differs so deeply from that of the chick that, in our opinion, it cannot be
omitted entirely.
The very thorough treatment of the stages given makes this laboratory
manual certainly of great value for the elementary student. We hope however
that the author will insert some further chapters in the next edition.
P. D. NIEUWKOOP
"THE ENERGETICS OF DEVELOPMENT.
a Study of Metabolism in the Frog Egg"
1954
by L. G. Barth and L. J. Barth Columbia University Press, New York
114 pp. with 17 figs in the text and Price: $ 3,
29 tabs
This book is published by the Columbia University Press together with
several other samples of current scholarship, on the occasion of the 200^^ year
of Columbia's existence.
As the authors state in the preface, our knowledge of the energetics of
development is at the present moment in a similar situation as morphological
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