In my response to question re Locke's Solution, it should read 6.5 g NaCl/liter (but, what's an order of magnitude?)! -- Peter W. Pappas, Professor/Chairperson, Department of Zoology, The Ohio State University, Columbus, OH 43210 USA E-mail: pappas.3 at osu.edu; FAX (614)-292-2030, PHONE (614)-292-8088