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phan residues, it is compelling to consider these two phenomena may be related.In this connection Hayashi, et a/.,12 have shown that a tryptophan residue is involved in the formation of the enzyme-substrate complex between lysozyme and poly-N-acetylglucosamine (glycol chitin). Further, it has been reported by Hartdegen and Rupley13 that an inactive derivative, altered only in a single tryptophan residue, may be obtained by oxidation of lysozyme by iodine in acidic solution. This modification and loss of activity were prevented by the presence of N-acetylglucosamine.Further improvement in instrumentation will be necessary before more accurate measurements of the small aromatic Cotton effects can be obtained. Efforts in this direction are now being made and further results will be published in due course.

conclusion that the amide rotation barriers for 3-piperidones are "significantly greater" than those in any of the other piperidides with the same acyl group is therefore erroneous.In Table II, correct AGC* are, respectively, 14.7,14.7,14.7,14.7, 14.7, and 14.8 keal/mol (including some minor changes in peak assignments recently communicated to me by Professor Szarek).The barrier height for 1-benzoylmorpholine calculated from Szarek's data is therefore in good agreement with those previously reported.