Crude protein, total lipid, water, cholesterol, and amino acid composition of the roe of eighteen Pacific marine species were determined and compared with those of muscle from the same marine species. Crude protein and total lipid were higher in roe than in muscle, while water was lower. Cholesterol in roe was generally tenfold higher than that of muscle but only around one-fourth that of hen egg yolk. Glutamic acid, leucine, and aspartic acid were generally found to be the major components of roe. Leucine and proline content were significantly greater in roe than in muscle. On the whole, roe was well balanced with the essential amino acid and had a good E/NE ratio and may be considered a food source of high-quality protein.
N.m.r. of Steroidal a-HaloketonesSir:The discovery' that axial hydrogens are more highly shielded than corresponding equatorial ones increased the use of n.m.r. chemical shift data in structural studies of cyclohexane systems. Interpretations of this differential shielding have been p r o p o~e d~,~~,~~d and scattered examples of exceptions to the rule have been reported.lbs4 We have found that a carbonyl group adjacent to a monohalogenated carbon in ster-(1) (a)
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