PDT ORIAL. 
Tue laudable efforts of the Russian geologists to make the 
proceedings of the seventh session of the International Geolog- 
ical Congress contribute materially to the advancement of the 
science along the lines of unification and reformation of classifi- 
cations and nomenclatures met with but partial success. The 
number of papers presented that bore directly on these problems 
was not large and their magnitude was inconsiderable. Never- 
theless it will appear in the future that the effort was much more 
fruitful than seemed at the time to be the case. The results in 
connection with the classification and nomenclature of stratified 
formations were more immediate and satisfactory than those 
relating to the same problems in petrography. Messrs. Frech 
and Bittner prepared papers that led to the formulation by 
Messrs. Karpinsky and Tschernyschew of definite propositions 
for the establishment of principles upon which may be based 
rules for the creation and use of stratigraphical terms. These 
were discussed by the congress and agreed to in part. A new 
committee was appointed to consider the principles of chrono- 
logical classification of sedimentary formations. The committee 
consists of active members and of consulting members. The 
former are: Messrs. Barrois, Capellini, Hughes, Renevier, Tietze, 
Tschernyschew, H.S. Williams, Zittel. Consulting members are: 
Choffat, Clark, Cortazar, Davy, Dawson, Déperet, Frech, Gries- 
bach, Karpinsky, Kayser, de Lapparent, Martin, Mayer-Eymar, 
Nathorst, Nikitin, Stefanescu, De-Stefani, Taramelli, Uhlig, Van 
der Broeck, Walcott, Woodward. 
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x 
The results in connection with the problem of the reformation 
of petrographic nomenclature were most disappointing to the 
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