REPORT OF NATIONAL, MUSEUM, 1925 71 



sent numerous lots of Physas to Dr. Frank C. Baker, University of 

 Illinois, for examination in connection with a report on the genus. 

 A few land shells were also loaned to Dr. H. A. Pilsbry, Academy 

 of Natural Sciences, to be figured. Several ophiurans and crinoids 

 were loaned to Dr. T. Gisten, University of Upsala, Sweden, 

 for examination in connection with studies of Scandinavian 

 echinoderms. 



The number of plant specimens lent to institutions or to indi- 

 viduals outside of Vf ashington during the past year was 16,566 com- 

 prised in 100 lots, more than twice the number sent out during any 

 previous year. The more important sendings were as follows: 

 Arnold Arboretum and the Gray Herbarium, Harvard University, 

 6,638 and 722 specimens respectively; University of California, 

 1,390, mostly from the Philippine Islands; New York Botanical 

 Garden, Bronx Park, 1,018 ; Botanical Garden and Museum, Berlin, 

 Germany, 895; A. K. Schindler, Jueterbog, Berlin, Germany, 616 

 specimens of Meibomia and related genera; Oakes Ames, Boston, 

 Mass., 507 orchids; Royal Botanical Gardens, Kew, England, 427 

 specimens; Academy of Natural Sciences, Philadelphia, Pa., 356; 

 Natural History Museum, Vienna, Austria, 275 ; Botanical Museum 

 of the University, Copenhagen, Denmark, 244 specimens. 



DISTRIBUTION AND EXCHANGE OF SPECIMENS 



Duplicates distributed to high schools, colleges, and other similar 

 institutions, aggregated 1,376, of which 745 consisted of mollusks in 

 5 prepared sets and one set of fishes of 77 specimens. 



Exchanges to the number of 15,904 were sent out, of which 1,969 

 were zoological specimens. Of the 13,935 plants thus distributed, 

 exchanges of 1,000 specimens and over were sent to the Arnold 

 Arboretum, the Botanical Museum, University, Copenhagen, the 

 Eoyal Botanic Garden, Edinburgh, and the Royal Botanic Gardens, 

 Kew, England. 



TOTAL NUMBER OF SPECIMENS IN DEPARTMENT OF BIOLOGY, INCLUDING 



DUPLICATE SPECIMENS 



As explained in previous reports, the number of specimens can not 

 be given with absolute exactness, because it would be a physical 

 impossibility to accomplish a count at the present time. The figures 

 cited are from counts previously taken to which there are added 

 the annual increments, and deducted the annual distribution or loss 

 of specimens due to initial defective preparation or other causes. 

 It is believed that the census is well within the limits of the actual 

 number of specimens on exhibition or contained in the study series 



