472 International Geological Congress. 



The proposition in regard to the Eruptive Eocks was then 

 taken up. 



Professor von Dechen declared that there should be no dis- 

 tinction made between the rocks of extinct and of active volca- 

 noes, or between ancient and modern eruptive rocks, but there 

 should be a strong distinction drawn between ancient tuff and 

 ancient eruptive, and between modern tuff and modern erup- 

 tive rocks proper. 



Dr. Beyrich agreed with his Excellency, Dr. von Dechen, on 

 this point. 



M. Blanford said it should be taken into consideration that 

 in parts of England, in the Hebrides, in parts of America and 

 'elsewhere, there were eruptive rocks, and lavas which resembled 

 stratified rocks very closely. He objected to the petrographic 

 division of the eruptive rocks, while the sedimentary rocks are 

 divided chronologically ; the more so, as many of the eruptive 

 rocks, like those he has instanced, strongly resemble the strati- 

 fied rocks. 



The whole matter was finally left to the committee on the 

 chart. 



The president pro tem. then passed to the second order of. 

 business, and gave the floor to Dr. ISTeumayr, who read the 

 report upon the proposed plan for the preparation of his Nomen- 

 clator Paleontologicus. 



5th Session, Oct. 3d, 10 a. m. 



At the morning session several scientific papers were read. 

 Among them was a report upon the system of coloration in 

 use in the United States Geological survey. Mr. McGee, who 

 had prepared this report, did not arrive till late in the prog- 

 ress of the Congress. The paper was presented to the council 

 in English, but the rule requiring all the communications 

 to the Congress to be presented in French, necessitated the 

 preparation of an abstract in that language. This abstract, 

 at the request of Mr. McGee, was presented to the Congress 

 by Dr. Frazer, together with prefatory and explanatory obser- 

 vations by himself regarding the map ; exhibiting the principal 

 features of the system which was displayed. 



At 2.30 P. M. the sixth and closing session of the Congress 

 was called to order. The journal of the last sitting was read and 

 approved. M. Hauchecorne made several amendments. 



Three sheets of the map of Galicia were presented, with a 

 letter from their author, Professor Szajnocha. A letter was 

 received from M. Abich, stating that he had returned to St. 

 Petersburg and had resumed his labors. 



M. Capellini(pres. pro tem.) called attention to the Nomencla- 

 tor Paleontologicus, of which M. Neumayr had given descrip- 

 tion yesterday, and recommended that it be published under the 



