310 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS References to books containing contributions from numerous authors appear as follows: (4) Gershon, S. D., et al., Permanent Waving, in Sagarin, E., Cosmetics: Science and Technology, Interscience Publishers, New York, N.Y., 1957, pp. 585-587. (d) Abbreviations: If at all possible, the metric system should be used. In accordance with modern practice, abbreviations such as cm, scc, rpm, ml, l, and mg are used without periods. It is requested that authors avoid all unusual nota- tions, i.e., milligram per cent (mg •) or ppm mg/100 g and mg/kg arc more acceptable terminology. Prefixes be- fore names of organic compounds must be italicized (cis-, p-, tert-, etc.). (e) Trade Names: A trade name must bc followed by the sign "©" This should be followed by an asterisk, which refers to a footnote which identifies the owner of the trade mark, his address, and any other information desired by the author. (f) Structural Formulas: Structural formulas should be used only if absolutely necessary and if the chemical in question is not well known to the reader. Structural formulas should be numbered and referred to in the text by Roman numerals. (g) Tables: Tables should be numbered consecutively, using Roman numerals. Figures: Photographs and drawings (including graphs) are figures and are numbered consecutively, using Arabic num- bers (e.g., Fig. 3). On the back of each the figure number, title of paper, author's name, and top of figure should be indi- cated. Captions should be typed, double-spaced, on a sep- arate sheet of paper. Photographs should be glossy prints, preferably 8•2 X 11 in. Drawings should not exceed 8•/• X 11 in. All numbers and letters must be sufficiently large on the original to make the smallest characters legible after reduc- tion to print size. Lettering of coordinates is part of the drawings and should not be set in type. A TYPEWRITER MUST NOT BE USED BECAUSE TYPING DOES NOT GIVE THE CLEAN, SHARP FIGURE NECESSARY FOR

PREPARATION OF MANUSCRIPTS 311 e . GOOD REPRODUCTION. Drawings should be in black on white tracing paper, tracing cloth, or good bond paper. Of course, black on white photographs of drawings and graphs are acceptable. Galley Proof--Galley proofs will be sent to the authors for care- ful corrections. Proofs should be verified against the manu- script. The Publication Committee will not accept this responsi- bility. Mailing instructions for the return of the manuscript and/or proofs within three days after receipt will accompany the proofs. Alterations in an article after it has been set in type are made at the author's expense, and it is understood that any such alterations shall be charged to the author. Any material set in type but ordered withdrawn from publication by the author must also be paid for by the author. Reprints--The senior author of each paper will automatically receive 50 over-run reprints free of charge. Additional reprints must be ordered at the time the galley proofs are returned.