Since the first edition of this pamphlet appeared in the year 1897, investigation in this department of scien­ce has made such marked progress, notwithstanding the sli­ght amount of material, that a revision has now become de­sirable. It can be readily understood, that a new science, an investigation on virgin soil, such as the Maya study is, ma­kes more rapid progress and develops more quickly than one pertaining to some old, much explored territory. In addition to numerous separate treatises, special men­