The process of marbling book edges and papers for use as end- sheets in bookbinding is simple in its general principles, but quite complicated in its application. From its induction it has appeared to be more of an art than a science and almost wholly dependent for its artistic success upon the taste and skill of the individual doing the work. There have been developed over many years a great variety of techniques and procedures in the procedures in the practice of the art. Topics covered in this article are: General principles involved; equipment and utensils required; the gum bath; carrageen moss; gum tragacanth; salep, plantago-psyllium (fleabane); karaya gum; functions of oxgall; other dispersing agents; sprinkling water; alum water; colors and their preparation for marbling; and a formula for binder.