AM told I must write a preface; that an apology or an excuse should be made to the public in general for presuming upon their good nature.   An apology would be a conceit.   My only excuse is a desire to awaken in the heart of every girl or woman an interest in her own individuality and possibilities, believing it a duty she owes herself and those by whom she is surrounded that she make physical beauty and individual dress a study in every detail.   My sincerest apology will be a re gret that I have not given more space to the subject, as its field is unlimited, and these few pages only a beginning of what might be said.