Few items of commerce are more ubiquitous or in more frequent use than soap. Few proprietary products have been offered over a longer period to the public by pharmacists, and by chemists and druggists before them, than some long established brands of toilet soap. Soap is perhaps the first manufactured substance with which we come into contact in our lives and it remains a daily necessity thereafter. For how long has this inexpensive but essential product been such a feature of daily ...