DEPARTMENT OF AGRICULTURE BULS. 1276-1300 



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Department Bulletin No. 1278. — Production of Henequen Fiber 

 in Yucatan and Campechb — Continued. 



Henequen fiber ± 13 



Present production 17 



Condition of plantations 17 



Market situation 18 



Future production of fiber 18 



Henequen in Campeche 19 



Summary 20 



Department Bulletin No. 1279. — Rural Highway Mileage, Income, 

 and Expenditures, 1921 and 1922: 



General summary 1 



General comparative data, Table 1 10 



Income for rural highway purposes, 1921, Table 2 11 



Expenditures for rural highway purposes, 1921, Table 3 13 



Rural road expenditures, 1922, Table 4 16 



Mileage of rural roads, by types, as of January 1, 1922, Table 5 17 



Mileage of rural roads, by types, 1914, Table 6 19 



Total mileage of rural roads and mileage surfaced, 1904, 1909, 1914, 



1921, Table 7 20 



Total mileage of rural roads, by types, built during 1921, Table 8 22 



Total mileage of rural roads, by types, built during 1922, Table 9 24 



Highway bonds, authorized, sold, and outstanding, Table 10 26 



Rural road mileage by types and systems in each State, Table 11 28 



Highway income and expenditures in each State, Table 12 51 



Comparison of State highway mileage and expenditures, Table 13__ 78 

 Comparison of income for highway purposes, by years, 1904, 1914, 



1921, Table 14 „ 79 



Comparison of bonds outstanding, 1914 and 1921, Table 15 80 



Motor vehicle registration by-years, 1913 to 1921, inclusive, Table 16 81 



Motor vehicle revenues by years, 1903 to 1921, inclusive, Table 17__ 82 



Motor vehicle registration and revenue, 1921, Table 18 85 



Motor vehicle registration and revenue, 1922, Table 19 87 



Department Bulletin No. 1280. — The Computation of Fertilizer 

 Mixtures from Concentrated Materials: 



Introduction 1 



The triangular system for fertilizer mixtures 4 



Factors that influence the concentration of fertilizers 5 



Concentrated fertilizer compounds 7 



Fertilizer mixtures from concentrated materials 10 



Standard fertilizer mixtures from' concentrated materials 12 



Summary 16 



Department Bulletin No. 1281. — Relative Utilization of Energy 

 in Milk Production and Body Increase of Dairy Cows: 



General scheme for experiments on milk production 2 



Changes in technic 3 



Plan of the experiments 4 



Animals 5 



Rations , 5 



Digestion experiments 6 



The respiration calorimeter 7 



Preparation of feed and feces samples for analysis 8 



Methods of analysis 8 



Live weights and rations 9 



Composition of feed and feces 9 



Apparent digestibility 10 



Hair and scurf removed by brushing 11 



Milk 11 



Methane 12 



Apparent digestibility of rations by improved method 13 



The respiratory gases 14 



Correction for milker 14 



The nitrogen and carbon balance 15 



Metalbolizable energy 15 



