CONTENTS. XV 



Page. 



Bulletin 154, The Life History of Loilgepole Pine in the Rocky Moun- 

 tains, D. T. Mason 542 



Bulletin 155, Wood Pipe for Conveying Water for Irrigation, S. O. Jayne_ 585 



Bulletin 156, Wirewornis Attacking Cereal and Forage Crops, J. A. 



Hyslop 555 



Bulletin 157, Tillage and Rotation Experiments at Nephi, "Utah, P. V. 

 Cardon 525 



Bulletin 158, The Nitrogen of Processed Fertilizers, E. C. Lathrop 217 



Bulletin 159, Soils of the Sassafras Series, J. A. Bonsteel 512 



Bulletin 160, Cactus Solution as an Adhesive in Arsenical Sprays for In- 

 sects, M. M. High 557 



Bulletin 161, The Mediterranean Fruit Fly In Bermuda, E. A. Back 655 



Bulletin 162, Horticultural Experiments at the San Antonio Field Sta- 

 tion, Southern Texas, S. H. Hastings and R. E. Blair . 539 



Bulletin 163, A Field Test for Lime-sulphur Dipping Baths, R. M. Chapiu_ 612 



Bulletin 164, Field Test with a Toxic Soil Constituent: Vanillin, J. J. 



Skinner 619 



Bulletin 165, Quassiin as a Contact Insecticide, W. B. Parker 649 



Bulletin 166, Ophthalmic Mallein for the Diagnosis of Glanders, J. R. 

 Mohler and A. Eichhorn 682 



Bulletin 167, Para-dichlorobenzine as an Insect Fumigant, A. B. Duckett- 650 



Bulletin 169, Injury by Disinfectants to Seeds and Roots in Sandy Soils, 

 C. Hartley 647 



Bulletin 170, The European Pine-shoot Moth : A Serious Menace to Pine 

 Timber in America, A. Busck 654 



Bulletin 171, Food of the Robins and Bluebirds of the United States, 



F. E. L. Real 648 



Bulletin 172, Varieties of Plums Derived from Native American Spe- 

 cies, W. F. Wight 744 



Bulletin 173, The Life History and Habits of the Pear Thrips in Cali- 

 fornia, S. W. Foster and P. R. Jones 850 



Bulletin 174, Farm Experience with the Tractor, A. P. Yerkes and H. H. 



Mowry 886 



Bulletin 176, Group Classifications and Varietal Descriptions of Some 

 American Potatoes, W. Stuart 830 



Bulletin 177, The PTOduction and Consumption of Dairy Products, E. 



Merritt 773 



Bulletin 178, Cooperative Organization Business ISIethods, W. H. Kerr 



and G. A. Nahstoll 792 



Bulletin 179. Native American Species of Prunus, W. F. Wight 837 



Bulletin ISO, Soil Erosion in the South. R. O. E. Davis 811 



Bulletin 181, A Report on the Methods and Cost of Reclaiming Over- 

 flowed Lands Along the Big Black River, Miss., L. A. Jones, W. J. 

 Schlick, and C E. Ramser 883 



Bulletin 182, Agricultural Alcohol : Studies of Its Manufacture in Gex'- 

 many, E. Kremers 613 



Bulletin 183, Morphology of the Barley Grain with Reference to Its 



Enzym-secreting Areas, A. Mann and H. V. Harlan 823 



Bulletin 186, A Method of Fumigating Seed, E. R. Sasscer and L. A. 

 Hawkins 650 



Bulletin 187. Preliminary Census of Birds of the United States, W. W. 



Cooke 648 



