l8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 76 



butions from the U. S. National Herbarium, and the cooperation is 

 in other ways particularly close. 



This relationship is equally close in other divisions of the Depart- 

 ment of Biology. Cooperation between the Division of Mammals 

 and the Biological Survey began in 1889 and has continued actively 

 in force to the present time. During this period (to December 31, 

 1922) the number of specimens of mammals alone brought to the 

 Museum by the Survey has been 126,240, besides thousands of speci- 

 mens of other classes. The mammal and bird material, by agreement 

 made June 10, 1889, is kept separate from the Museum collection 

 proper, and is reserved for the use of the Survey. For handling this 

 collection the Museum has furnished services in cataloguing, clean- 

 ing, and numbering the specimens. The Survey has taken charge of 

 the arrangement and general management of its collections, employ- 

 ing for this purpose a force which has averaged, during the past ten 

 years, five persons. 



The work of the Division of Insects and that of the Bureau of 

 Entomology are so closely related that it is difficult at some points to 

 draw a line of separation. The Museum affords office space to 14 

 specialists of the Bureau staff, and about 12 preparators, typists, in- 

 dexers, etc. The primary function of these specialists is to deter- 

 mine material sent in by the field workers of the Bureau throughout 

 the United States. This makes it necessary that they should have 

 access to correctly named and extensive collections. Hence it has 

 been arranged that each should have charge of the group in the 

 Museum's collections in which he specializes. 



Mississippi Pearl Fisheries. — In 1907 Dr. Paul Bartsch was de- 

 tailed to the Bureau of Fisheries to undertake an investigation of 

 the pearl fisheries of the Mississippi. This survey resulted in the 

 accumulation of material which threw light upon the then existing 

 distribution of the various species of fresh water pearly mussels, 

 their abundance, and likewise their utilization. Information was also 

 gathered pertaining to the output of fresh water pearls and the pearl 

 button industry. 



Research work on Shipivorms. — In cooperation with the American 

 Wood Preservers Association, Dr. Bartsch has been called upon in 

 connection with various topics covering the shipworm, a pest which 

 causes an annual loss of millions of dollars in American waters. 



He has also been called upon to identify the material taken by the' 

 New York Committee on Marine Piling Investigations of the Na- 

 tional Research Council in their reconnaissance work. 



