XII DEPARTMENT OF AGRICULXURE BULLETINS 51-75. 



Department Bulletin No. 72. — Suitability of Long-leap Pine for 



Paper Pcjlp — Continued. Page. 



Autoclave tests 14 



Practical significance of the experiments 25 



Department Bulletin No. 73. — Raising and Fattening Beep Calves in 

 Alabama. 



Statements of former work 1 



Details of the exj>eriment 2 



Objects of the work 2 



The cattle used 2 



Management of the herd 3 



Prices and character of feeds 4 



Method of conducting the work 5 



Summary statements 10 



Department Bulletin No. 74. — Inland Boat Service: Freight Rates on 

 Farm Products and Time of Transit on Inland Waterways in the 

 United States. 



Purpose and scope of inquiry 1 



River traffic defined 1 



Relative importance of river traffic 2 



Market values of products transported by water 3 



Some advantages of rail over river 4 



Some advantages of river over rail 4 



Terminals and landings 5 



Typical steamboat routes , 6 



Local traffic .; 10 



Characteristics of steamboat freight rates 10 



Illustrations afforded by the Norfolk trade 10 



Freight traffic zones 11 



Blanket rates 12 



Uniform basis of comparison 12 



Groups of waterways 12 



Rail and water rate compared 13 



Distance and time of transit 13 



Number of landings 14 



Summary of rates of transit 14 



Freight rates and farm prices 14 



Department Bulletin No. 75. — Alfalfa Seed Production: Pollination 

 Studies. 



Introduction 1 



Previous investigations of the structure and pollination of the alfalfa 



flower 2 



Structure of the alfalfa flower 7 



Relation of tripping to the development of seed 10 



Relation of insects to tripping 12 



Effect of pollen from different sources 16 



Relation of the number of flowers per raceme to the number of pods formed . 19 



Automatic tripping 19 



Pollination in relation to the rupture of the stigmatic cells 24 



Artificial agencies effective in tripping 25 



Effect of age of flowers upon susceptibility to fertilization 26 



Force necessary for tripping 27 



Effect of partial shade 28 



Practical aspects of tripping 29 



Tripping in relation to seed setting in annual medicagos 30 



General conclusions 31 



