International Congress of Geologists. — Frazer. 341 
once, without interfering with the iihimate development of the 
classification and dismemberment of these groups in subdivi- 
sions. Adopted. 
Seventh suggestion. It is desirable to designate the prin- 
cipal types of structure by special names. Adopted. 
Ninth suggestion. It is necessary to avoid the employment 
of the same denomination (of identical term) in different 
senses. Adopted. 
Tenth suggestion. The employment and creation of dif- 
ferent terms to designate the same idea, the same rock, or the 
same group of rocks, should be avoided wherever possible. 
Adopted. 
Thirteenth suggestion. The employment of pre-existing 
names, or the assignment to them of a new meaning, by re- 
stricting or enlarging their significations, should be avoided 
wherever possible. 
The secretary exhibited the proof of the petrographic lexi- 
con of M. Loewinson-Lessing. 
M. Zirkel was elected president of the commission of Petrog- 
raphy. An executive committee of the petrographic commit- 
tee was chosen, consisting of Becke, Barrois, Brogger, Loewin- 
son-Lessing, Pirsson. 
R'. Section of Api^lied Geology. 
M. Moiirlon. "The new paths of Belgian geology." 
M. Gosselet. "The salt waters met in the aquiferous areas in north- 
ern France. 
.1/. Van dcr Vciir. "The enlargement of the Kingdom of the Neth- 
erlands by the drawing of the Zyderzee." 
M. Thcvenni. "The plateaux of the Hautes Pyrenees and the dunes 
of Gascony." 
V. d. Broeck. "The applications of geology." 
M. Kunz. "The progress of the production of precious stones in 
the United States." 
.1/. L. Janet. "The enclosing and protection of the springs of pota- 
ble water." 
.1/. dc Ricliard (read by the president). "The origin of petroleum."'. 
Final General Session. 
M. Matthew, Jr., presented in the name of his father a 
note, printed by the congress, on "The most ancieijt paleozoic 
faunse." 
