Abstract
A few selected topics from four papers by Samuel on the theory of valence are critically examined. The conclusions are drawn that Samuel's bond‐moments for molecules containing ``pentacovalent nitrogen'' are not as satisfactory as claimed, and provide no evidence in favor of the existence of pentacovalent nitrogen; that Samuel's eigenfunctions for structures with pentacovalent nitrogen are identical with the ones set up in the now conventional manner for structures without pentacovalent nitrogen but with semipolar double bonds instead; that the existence of antibonding orbitals seems to be theoretically necessary; and that several of Samuel's further conclusions are either based upon the use of words in unfamiliar senses, or else are erroneous.
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