94 REPORT OF NATIONAL MUSEUM, 1923. 



crystallographically, and the minerals from the limestone quarry at 

 Leesburg have been described for publication. A gahnite collected 

 at the copper mines of Carroll County, Md., has been analyzed 

 and described as being of especial interest in owing its intense blue 

 color to cobalt. 



Assistant Curator Foshag has completed his study of borates and 

 their genesis. The minerals serpentine (false jade), centrallasite, 

 priceite, lavendulum, glaucophane, and anthophyllite have been 

 investigated, and the following are under investigation : Hydrous 

 calcium silicate, probably new, anapaite, and chlorastrolite. A study 

 of the minerals in cavities in lavas and their genesis is in progress, 

 and data on the study of solution at high temperature and its rela- 

 tion to ore deposition are now being collected. 



These laboratory investigations are of advantage to the Museum 

 in that many rare or new minerals, hitherto unrecognized, are found 

 in the collections, and many errors in labeling are eliminated. 

 Unfortunately, however, it has been necessary to conserve space by 

 eliminating duplicates, and in working over this old material it is 

 often found, after the investigation is completed, that only a single 

 small specimen remains of an ore proven to have a unique scientific 

 value. Consequently, where investigations are based upon new 

 material, every effort is made to secure an adequate supply in order 

 that specimens may be used to build up the collections by exchanges. 



Paleontological researches have been actively carried on by all 

 members of the staff of the division, as well as by others working on 

 the Museum's collections. Secretary Walcott prepared a paper 

 descriptive of the brachiopods of his last summer's collections, the 

 graptolites having been sent to Dr. Rudolph Ruedemann, of the New- 

 York State Museum, who made a preliminary identification of the 

 species. Dr. R. S. Bassler has continued liis work on the stratigraphy 

 and paleontology of a portion of the Central Basin of Tennessee, 

 which he expects to complete and submit to the geological survey 

 of that State for publication during the coming year. In collabora- 

 tion with Ferdinand Canu, he has completed the manuscript, but not 

 the illustrations, on the Bryozoa of the Philippines dredged by the 

 Albatross^ and has continued work on the Recent Bryozoa of the 

 Gulf of Mexico for comparison with American Tertiary forms. 



Dr. E. O. Ulrich has completed a report dealing with the Early 

 Paleozoic formations of Wisconsin, which will be published by the 

 State, although based on Museum collections. Doctor Ulrich, with 

 Dr. C. E. Resser collaborating, has continued researches on the 

 Upper Cambrian stratigraphy and fossils of Wisconsin, and has 

 devoted some time to researches on the faunas of the Ozarkian and 

 Canadian systems. 



Special investigations by Dr. Frank Springer comprise a mono- 

 graph upon the Silurian crinoids of the Ohio Valley, based chiefly 



