186 DEPAETMENTAL BEPORTS. 



bodied in a bulletin on the basket-willow industry. Further plantings 

 on the Arlington Experimental Farm have permitted a wider range of 

 experiments, which are establishing other important facts. It is 

 intended to embody these in a circular to be issued during the coming 

 winter. 



STUDY OF SUGAR-MAPLE GROVES. 



A careful field study was made in the eastern sugar-making districts' 

 of the needs of typical old forest-grown sugar-maple groves, and of 

 the treatment required to convert dense seedling and pole-maple 

 thickets into future sugar bushes. The results form the basis of help- 

 ful instructions which have been incorporated in the bulletin on the 

 maple-sugar industry previously prepared for printing. 



Expositions. 



The Bureau's forest exhibit at the Louisiana Purchase Exposition, 

 St. Louis, Mo., was installed in Maj', 1904. An indoor exhibit covers 

 5,000 square feet of floor space and comprises some 12 special features. 

 Large photographic transparencies and colored bromide enlargements, 

 relief maps, charts, timber and other specimens, instruments, etc., 

 afford a complete survey of typical forest conditions and of the use of 

 the foi'est and its destruction in the United States, as well as an expo- 

 sition of the principles and practice of forestry as applied by the 

 Bureau of Forestr3^ An outdoor exhibit covering 2^ acres illustrates 

 tree-planting plans for farm woodlots and windbreaks adapted to dif- 

 ferent parts of the country and forest nursery methods. The allot- 

 ment for preparing the display was $7, .500. 



Forest Library and Photographs. 



The forest library contains 4,227 books and pamphlets, of which 543 

 were added this year. The forest photographic collection comprises 

 13,860 mounted and classified pictures and 2,320 lantern slides; 4,384 

 photographs and 502 slides were added this year. Photographs ai'e 

 taken in connection with the Bureau's field work, and constitute invalu- 

 able records for reference. 



During the year l,(i7*) photographs (mainly unmounted) were given 

 to educational institutions and to individuals for use in illusti'ating 

 books and magazines and newspaper articles on forest subjects and in 

 educational work, and 635 lantern slides were loaned. The requests 

 for loans and gifts were from 27 States and 4 foreign countries and 

 from 26 educational institutions. 



Foreign forest photographs were obtained by exchanging sets of 

 American pictures for those of other countries. Seventy -five sets of 

 our photographs were sent and 73 sets received in exchange. In addi- 

 tion, upward of 200 foreign and home pictures have been presented 

 to the collection by correspondents and friends of the Bureau. Notable 

 among these is a valuable set of Chilean pictures from Mr.H. J. Elwes, 

 of London, England ; Georgia, Florida, and Texas views from Mr. R. M. 

 Harper; and photogi'aphs of Michigan pine forests from the State agri- 

 cultural college. A tabular record of the regions and subjects covered 

 by the Bureau's photographs, now in preparation, will assist a system- 



