340 The American Geologist. June, 1901. 
M. F. Hume, i) "The rift valleys of Sinai." 2) "Notes on the 
geology of the eastern desert of Egypt." 3) "The valleys of eastern 
Sinai." 
III. Section of Mineralogy and Petrography. 
M. Michel-Levy, as president of the international commit- 
tee on petrography, read the following suggestions which the 
foreign scientific members expressed. 
First suggestion. The names of the authors shall always be 
placed after the names of the rocks as is the custom in zoology 
and botany. 
Second suggestion. That the congress name an interna- 
tional committee to publish the new names of rocks with as 
precise a description as possible, with their chemical analyses, 
and, if necessary, with an illustration reproducing their struc- 
ture. This publication will take place in the transactions of 
the congress. 
The committee appointed consists of : Rosenbusch, AVein- 
schenk, Zirkel,, Boecke, Dolter, Tschermak, A. Geikie, Judd, 
Teall, Twelvetrees, Renard, Hussak, Adams, Ussing, Cal- 
deron, Hagtie, Iddings, Pirsson, Fouque, Lacroix, Michel 
Levy, Barrois, Ramsay, Sederholm, Sabatini, Striiver, Viola, 
Koto, Brogger, Reusch, Wichmann, Alrazec, Karpinsky, La- 
gorio, Loewinson-Lessing, Zujovic, Duparc, Schmidt, Back- 
strom, Tornebohm. This committee has the right to add to 
its number. 
Third suggestion. It is desirable to regulate the nomen- 
clature of the eruptive rocks, where the lack of unity is partic- 
ularly felt. Different authors attribute dift'erent significations 
and senses to one and the same name, and conversely different 
denominations are employed to designate the same rock, the 
same group of rocks, or the same structure. All these incon- 
veniences of nomenclature can and ought to be abolished. At 
least for the great groups. 
Fotirth suggestion. The characteristic of the great group 
(for example, families) should be based upon the mineralogical 
composition, supported by chemical composition and structure. 
This request was adopted with 19 dissenting votes. L6w- 
inson-Lessing's motion that chemical composition shall be the 
characteristic of first importance in the great groups, received 
nine votes. 
Fifth suggestion. The great groups can be determined at 
