150 PR0CEEDI2s'GS OF THE MINERALOGICAL SOCIETY 



COMPOSITION OF THOMSONITE 

 BY EDGAR T. WHERRY 



VOLUME ISOMORPHISM JX THE SILICATES 

 BY EDGAR T. WHERRY 



URANITE GROUP: AUTUMTE. CARXOTITE, SIXCOSITE, ETCETERA 



BY W. T. SCHALEB 



Read by Frank R. Van Horn. 



USE OF PROJECTION APPARATUS IN TEACHING CERTAIN PHASES OF ' 



MINERALOGY 



BY EDWARD H. KRAUS 



OCCURRENCE OF LEU CITE IN THE ALB AN HILLS 

 BY HEXRY S. WASHINGTON 



CRYSTALLOGRAPHY AND OPTICAL PROPERTIES OF A URANIUM MINERAL 

 (SCHOEPITE), FROM THE CONGO 



BY T. L. WALKER 



ELLSWORTHITE, NEW HYDROUS URANIU2I COLUMBATE FROM HYBLA, 

 HASTINGS COUNTY, ONTARIO 



BY T. L. WALKER AND A. L. PARSONS 



VANADIUM DEPOSITS OF THE SOUTHWEST AFRICAN PROTECTORATE 



BY CHARLES PALACHE 



DLiMOND MINES OF SOUTH AFRICA 

 BY CHARLES PALACHE 



