62 Tlic American Gcolosrist. 
July, 1898 
Prof. Martin described the granite and gneissic rocks of that 
region and their residual products. He also commented on 
the character of the Potomac, Lafayette and Columbian forma- 
tions which are well exposed in the railroad cuts south of the 
city. The paper was discussed by Prof. Dodge and Dr. Ries. 
The next paper of the evening was by Prof. J. F. Kemp 
on "Some Remarks on Titaniferous Magnetites." The speaker 
discussed the formula of ilmenite and stated that it was prob- 
ably a mixture of FeO'TiOj and// Fe.^O.^. The amount of 
titanium present in the titaniferous magnetites is very variable, 
running sometimes as high as 40 per cent; in the Adirondack 
ores it is 10 to 20 per cent. Magnetic methods of separation 
have not yet proved successful for the elimination of the titan- 
ium. Nearlv all of the titaniferous magnetites show small 
amounts of MnO, Cn^Og, CoO, NiO, V^O., and MgO, 
The latter suggests the presence of spinel. SiOj and Al.^O.^ 
have also been found, but phosphorus and sulphur are rare. 
Prof. Kemp suggested that these rarer constituents might have 
some influence on the metallurgical behavior of the ore. The 
native and foreign occurrences of the ores were alluded to. 
Discussion of the paper was by Prof. Martin, Dr. Ries and 
Mr. Kunz. 
HEtNRlCH RiES, Secretary. 
Geological Society of America. The tenth 
summer meeting of this society will be held, in conjunction 
with the American Society for the Advancement of Science, 
Tuesday, August 23rd, in the lecture hall of the Boston So- 
ciety of Natural History, Boston, Mass. The council will 
meet Monday evening, August 22nd, and the society will be 
called to order on Tuesday morning at 10:30 o'clock. The 
hotel headquarters is the Copley Square. The preliminary 
announcement circular of the A. A. A. S., which convenes 
August 22nd, will be sent to the fellows of the Geological So- 
ciety who are not members of the Association. All arrange- 
ments described in this circular relating to entertainment, 
transportation, etc., apply to the Geological Societv and other 
societies meeting in conjunction with the Association. 
Prof. Edward W. CLAYPOLE,ofBuchtel College, Aknin, 
Ohio, has accepted the chair of science in the Polytechnic In- 
stitute of Pasadena, California. He expects to enter upon his 
new duties in September. 
Prof. N. H. Winchell, managing editor of this jour- 
nal, has been spending the past few months in Paris in petro- 
graphical study and investigation. He expects to return 
home the latter part of June. 
The Geological Department of the Johns Hop- 
kins University has just closed an encampment of sev- 
