414 AI^TT^UiVL REPORTS OF DEPARTMENT OF AGRICULTURE. 



PHOTOGRAPHIC WORK. 



There were developed in the photographic laboratory 2^54 nega- 

 tives, 14,584 prints were made, 771 lantern slides, 240 bromide en- 

 largements, and 1,893 photostat print-. 



In addition to this work, 868 lantern slides were colored for lec- 

 ture work and 240 maps were mounted on cloth. 



For tlie benefit of various individuals and organizations, including 

 employees of the office, 2,710 lantern slides, 11,740 prints, and 200 

 bromide enlargements were loaned. At the close of the year the 

 photographic files contained 18,951 negatives, 01,041 prints, and 

 10.G14 lantern slides. 



ROAD MANAGEMENT AND ECONOMICS. 



Tlic economic highway survey inaugurated toward the end of the 

 fiscal year ended June 30, 1917, has been continued, but on a lesser 

 scale than during tlie fiscal year 1918. This condition was brought 

 about by the participation of this bureau to a large extent in activ- 

 ities connected with war work, and later to the added stimulus 

 given road construction by the increased appropriations made by 

 Congress for Federal aid work. The office work of completing 

 the final maps of the area surveyed has been in progress during 

 the year. The complete maps and text give detailed information 

 on the roads, bridges, and economic conditions in the territory cov- 

 ered by the surveys. This Avork has proved of considerable value, 

 as it brings together in a workable manner a vast amount of de- 

 tailed highway information. The work has not only been of value 

 to the State higliAvay depai'tments and this bureau, but is proving 

 of value to other branches of the Government. 



A large amount of data has been compiled relative to the tonnage 

 of the products of the field, forest, and mine for the various counties 

 in the United States. This information finally tabulated will be 

 of considerable value in connection with the future planning of 

 main-line highways, and will also govern to a Considerable extent 

 the types of pavement to be constructed on these highways. 



ECONOMIC STUDIES OF HIGHWAY SYSTEMS. 



The study carried out during the preceding year of the classifi- 

 cation of highway's and of the procedure followed in their con- 

 struction and maintenance has been completed, and the final results 

 have been published in serial form in Public Koads Magazine 

 \nider the caption, " State Highway Management, Control, and 

 Procedure." These articles are found in the issues, July, 1918, to 

 February, 1919, inclusive. 



FARM IRRIGATION INVESTIGATIONS. 



Conclusion of the Avar terminated the many special investiga- 

 tions which liad been made in belialf of the Capital Issues Com- 

 mittee regarding the feasibility and desirability of irrigation and 

 drainage enterprises in course of promotion. Demands for this Avork 

 Avere promptly succeeded, hoAvever, by calls for advice and technical 

 assistance from many irrigation and drainage districts, organized 



