MUSEUM OF COMPARATIVE ZOOLOGY. 37 



REPORT ON THE GEOLOGICAL COLLECTION . 



By Robert W. Sayles. 



During the past year there have been added to the exhibition 

 collections 825 specimens. 



Prof. W. M. Davis has very kindly given fifty specimens of 

 beach sands collected during his trip to some of the coral islands 

 of the Pacific in 1914. These specimens, Canada balsam mounts, 

 give a good idea of the nature of beach materials among coral 

 islands. 



Through his tact and efficiency Mr. G. M. Flint's collecting 

 trip in the summer of 1914 was most successful; he obtained over 

 1000 specimens of which 725 are catalogued and on exhibition. 



A list of the localities visited and the nature of the materials 

 collected includes: — Buffalo, N. Y., cubes of N. Y. state building 

 stones; Cleveland, Ohio, samples of building stones quarried in 

 Ohio; Berea, Ohio, grindstone materials; Latonia, Kent., f ossifer- 

 ous limestone showing alteration rim; Magnet Cove, Ark., specimens 

 of syenites and a 10 lb. lodestone; Hot Springs, Ark., novaculite, 

 a collection of graptolites from the Silurian slates, and a section 

 of pipe clogged by deposition from thermal waters; Benton, Ark., 

 Fuller's earth, bauxite, and residual clays with a set showing the 

 various stages in the manufacture of pottery; Berger, Ark., 

 bauxite; Little Rock, Ark., country rock of the Arkansas diamond 

 mines; Oklahoma City, Okl., cubes of building stones and eco- 

 nomic specimens; Ada, Okl., a set illustrating the manufacture 

 of Portland cement; El Paso, Tex., Portland cement specimens, 

 a collection of typical Cretaceous (Comanchic) fossils, specimens 

 of clays and coals; Bisbee, Ariz., a large collection of stalagmites; 

 Tucson, Ariz., Hubnerite; San Diego, CaL, cubes of building stones, 

 a collection of Miocene rocks, a large mass of granite with segrega- 

 tions (from Dehesa); Los Angeles, CaL, various building stones 

 including a large slab of the newly discovered brecciated marble 

 from the Mojave Desert, also economic specimens; San Francisco, 

 CaL, cubes of building stones, economic material, some small 

 iridescent limonite stalactites from Shasta Co.; Salt Lake City, Ut. f 

 a collection of Utah coals, Tintic ores, sets showing the manufac- 



