JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS below 8.3 no colour at all there is no intermediate tint, only a difference in intensity on proceeding from 8.3 to 10.0. It will, of course, be realised that this talk skims over the surface of the subject of pH value--after all, many large treatises have been written on the matter--but it is hoped that what I have said will indicate some of the pitfalls that await the unwary when they talk too blithely of "pH." After all the pH value describes one property of a solution, and an aqueous one at that. It does no more than give a measure of the effective acidity (or alkalinity) which may be an important feature, but is seldom of use without qualification. ERRATA to Vol. ¾I, No. 2. Page 142, lines 23, 25 and 28, "W. Navarre" should be "Eddie Navarre ". Page 154, line 19, insert "Dr." between "Schnell" and "E.O." 298