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In addition to the information included about Alexander von Humboldt grants to US scientists (September, page 80), it should be noted that self‐applications are not possible. Only German research scientists and German institutes are entitled to nominate American scientists for the Award which allows them to carry out research of their choice at various German institutes.

The third sentence of the fourth paragraph of Herman M. Schwartz's review of The Special Theory of Relativity (December, page 51) should read “more importantly, space‐time covariance methods are usually handled with undue restraint, as, for example, on pages 108–109 where the derivations are tortuous, and the gratuitous equation following (6.1.8) is strange.”