200 EEPOKT OF NATIONAL MUSEUM, 1888. 



Owing to the numerous calls from educational institutions for dupli- 

 cate materials work was begun early in the spring with a view to pre- 

 paring fifty sets, of some fifty specimens each, showing the more com- 

 mon forms of rock types. These sets are as yet far from complete ; in 

 every case some of the most important rock groups being wholly un- 

 represented. This is due to the fact that the materials necessary for 

 these are to be found only in the West, whence the Museum has at 

 present no means of obtaining them. The curator has on sundry occa- 

 sions endeavored to bring about some arrangement whereby field par- 

 ties in the employ of the U. S. Geological Survey should procure for 

 us the desired materials. Up to date such attempts have been only 

 partially successful. 



The more important accessions of the year are included in the follow- 

 ing list: 



(1) An interesting series of Devonian marbles and miscellaneous eruptive rocks, 

 receivea in exchange for other material from Mr. E. N. Worth, curator of petrology 

 in the Plymouth Institute, Plymouth, England. 



(2) A fine block of contorted schist from Brandon, Vermont, collected for this de- 

 partment by Mr. F. H. Knowlton, of the Department of Fossil Plants. 



(3) A large series of eruptive rocks, minerals, vein and joint formations, etc., from 

 New Jersey, Rhode Island, Massachusetts, and Maine, collected by the curator during 

 his summer vacation. Especially valuable in this series are the Metasomatic serpen- 

 tines from Moutville, New Jersey; the Kersantite from Franklin Furnace in the same 

 State; the contorted gneiss and vein formations from Maine. I call particular at- 

 tention to this collection, since a large proportion of it is of such a nature as to be 

 unobtainable but by sending a collector into the field for the express purpose. 

 Later this material was supplemented by a small collection of serpentine, miscellane- 

 ous eruptive rocks and fragments of a new meteorite obtained by the curator while 

 in San Francisco in March. A portion of the material mentioned above furnished 

 data for special papers.* 



(4) An interesting series of Pyrite concretions from New Foundland, and some 

 twenty specimens phonolite from the Black Hills, Dakota, received in exchange from 

 Prof. W. O. Crosby. 



(5) Two slabs of polished Algerian and English marbles. Gift of E. Fritsch 515 

 and 517 west Twentieth street. New York. 



(6) Some 500 pounds Glaucophane rock from near mouth of Sulphur Creek, 

 Sonoma County, California, collected for the Museum by W. L. Jones. 



(7) A selected series of geological material comprising metamorphosed chalk, cone 

 in cone, contorted gneiss and contorted fossil, volcanic bomb from the Auvergne, and 

 three specimens showing vein structures received from A. A. Duly in exchange for 

 other material. 



(8) Some 300 pounds Peridotite from near Webster, North Carolina, collected for 

 the Museum by Mr. W. H. H. Schreiber. 



(9) Several fragments of Fulgurite tubes from Cedarville, New Nork; gift of H. S. 

 Garrison (through R. Burns, of the U. S. Geological Survey). 



nO) Some 600 pounds volcanic rocks from the vicinity of Bozeman, Montana; 

 collected for the Museum by James Forristell. 



(11) A relief map of Oahu, received from Prof. C. H. Hitchcock, of Hanover, New 

 Hampshire, in exchange. 



* See Bibliography, section iv of the report. 



