Recent Developments in General Relativity. A collection of papers dedicated to Leopold Infeld. Panacutestwowe Wydawnictwo Naukowe, Warsaw, Poland; Pergamon, New York, 1962 (order from Macmillan, New York). 472 pp. $8

Abstract

rect quotations from original sources are used liberally. This technique is in line with the stated objective of describing atolls, an objective that is admirably attained. Although future studies will add major and minor details of ecology, the book serves a timely need.Unfortunately, but doubtless because of his objective, Wiens made less use of cross-references between different fields of study than might be desirable; he preferred to treat each as a separate entity. Perhaps for the same reason, there are few new deductions or discoveries resulting from the compilation. The book is essential reading for future workers on atolls, regardless of their fields of inquiry.

Quantum gravity: a progress report

“…Some of these problems may be alleviated by a slightly different approach to Dirac quantization, the 'functional Schrödinger representation' [173][174][175]. In this approach, we isolate a choice of time before quantizing, by choosing a classical 'time function' T [q, π; x] built from the metric and momenta.…”