414 ANNUAL REPORTS OF DEPARTMENT OF AGRICULTURE. 



PHOTOGRAPHIC WORK. 



There were developed in the photographic laboratory 2,254 nega- 

 tives, 14,584 prints were made, TTl lantern slides, 249 bromide en- 

 largements, and 1,893 photostat prints. 



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

 ture work and 240 maps were mounted on cloth. 



For the benefit of various individuals and organizations, including 

 employees of the office, 2,716 lantern slides, 11,746 prints, and 206 

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

 photographic files contained 18,951 negatives, 64,041 prints, and 

 10,614 lantern slides. 



ROAD MANAGEMENT AND ECONOMICS. 



Tlie 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 wdth Avar 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 Avork has not only been of value 

 to the State liighAvay departments and this bureau, but is proving 

 of A^alue 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 Avill also goA^ern 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 highways and of the procedure folloAved in their con- 

 struction and maintenance has been completed, and the final results 

 have been published in serial form in Public' Roads Magazine 

 under the caption, " State HigliAvay Management, Control, and 

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

 February, 1919, inclusiA^e. 



FARM IRRIGATION INVESTIGATIONS. 



Conclusion of the Avar terminated the many special inAestiga- 

 tions Avhich had been made in behalf 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, hoAvcA'er, by calls for advice and technical 

 assistance from many irrigation and drainage districts, organized 



