HE present list, for two years only, includes 373 names : of these, 31 are errors; 114 are other spelling variants, including French and German transliterations of Russian names; 12 are names for mixtures, pseudomorphs, or mineral groups; 2 are for hypothetical compounds, not known either naturally or artificially; and 50 are synonyms, new names for minerals already named, and not preferable to the old names. Further, 15 are for inadequately characterized minerals, and 30 are unnecessary varietal names. Of the remaining 119 acceptable names, 15 are for artificial compounds not known in nature, 6 are for endmembers of isomorphous series, not actually observed in nature, and 5 are desirable new names to replace names whose connotation was misleading; finally, there are 93 new named species or varieties worthy of distinctive names. A large number of minor spelling variants (e.g. hyphens, capitals to the second member of German compound names) have been omitted, since they cannot lead to confusion, and so have a nmnber of hyphened names such as Talc-saponite and Montmorillonite-chlorite, used by clay mineralogists for minerals with regularly alternating layers of the structures denoted in the name (and sometimes for minerals with irregular interstratification). No attempt has been made to seek out the first use of the spelling variants listed, and they are, therefore, not attributed to any specific author and date.