370 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (about 100 grams) of white or albino negroid hair that is highly kinked, and, preferably, it should be from a single human head. QU•.STION: What relationship does this work have to the recent studies of Pauling and Corey, which show that many proteins have an a-helical configuration that is, the protein molecule is a rather tightly packed coil? /lnswer: Perhaps none, since the ortho-para behavior appears to be related to an assembly of protein molecules rather than to single molecules. A major difference between the two cortex fractions is the cystine content. If the cystinc disulfide bonds serve to cross-link a-helices of the type pro- proposed by Pauling and Corey, it may be that the cystinc difference would affect the way the a-helices are twisted together. Pauling envisions that a-helices (single molecules) to be twisted together to form a still larger, and still helical, assembly of molecules. In this connection, it would be useful to make structural studies with kid mohair (ortho) and human hair (para), if possible, of the sort that Pauling and Corey have made. QUESTION: Wouldn't it be a good idea to make amino acid analyses of your kid mohair and human hair samples to check on the amino acid analysis work of Golden, et al.? alnswer: It certainly would, and we would be delighted to have another graduate student (Golden was one) sent to us who would be interested in doing such work. If he can gain admission to Princeton's Graduate School, please send us his name and address. (Laughter.) J. H. DUSENBU•¾ FOAM TRANSITIONS AND FOAM PERSISTENCE* By M. B. EPSTEIN Onyx Oil & Chemical Co., .Tersey City, N. yt. THE COSMETIC INDUSTRY has a special interest in the persistence of foam. In the development of shampoos, shaving preparations, bubble baths and other toilet articles considerable effort has been expended in finding materials and formulations which can produce long lasting foams. The requirements of the cosmetic industry in these respects differ from other important applications of surface-active agents. Thus with respect to detergents for laundering, high sudsing is not at the moment regarded in some circles as essential for technical or marketing purposes and in some situations is unnecessary and undesirable. * Presented at the May 13, 1955, Meeting, New York City.

370 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (about 100 grams) of white or albino negroid hair that is highly kinked, and, preferably, it should be from a single human head. QU•.STION: What relationship does this work have to the recent studies of Pauling and Corey, which show that many proteins have an a-helical configuration that is, the protein molecule is a rather tightly packed coil? /lnswer: Perhaps none, since the ortho-para behavior appears to be related to an assembly of protein molecules rather than to single molecules. A major difference between the two cortex fractions is the cystine content. If the cystinc disulfide bonds serve to cross-link a-helices of the type pro- proposed by Pauling and Corey, it may be that the cystinc difference would affect the way the a-helices are twisted together. Pauling envisions that a-helices (single molecules) to be twisted together to form a still larger, and still helical, assembly of molecules. In this connection, it would be useful to make structural studies with kid mohair (ortho) and human hair (para), if possible, of the sort that Pauling and Corey have made. QUESTION: Wouldn't it be a good idea to make amino acid analyses of your kid mohair and human hair samples to check on the amino acid analysis work of Golden, et al.? alnswer: It certainly would, and we would be delighted to have another graduate student (Golden was one) sent to us who would be interested in doing such work. If he can gain admission to Princeton's Graduate School, please send us his name and address. (Laughter.) J. H. DUSENBU•¾ FOAM TRANSITIONS AND FOAM PERSISTENCE* By M. B. EPSTEIN Onyx Oil & Chemical Co., .Tersey City, N. yt. THE COSMETIC INDUSTRY has a special interest in the persistence of foam. In the development of shampoos, shaving preparations, bubble baths and other toilet articles considerable effort has been expended in finding materials and formulations which can produce long lasting foams. The requirements of the cosmetic industry in these respects differ from other important applications of surface-active agents. Thus with respect to detergents for laundering, high sudsing is not at the moment regarded in some circles as essential for technical or marketing purposes and in some situations is unnecessary and undesirable. * Presented at the May 13, 1955, Meeting, New York City.