LIST OF TABLES 



I. Plant-food Elements 3 



II. Range of Temperatures at which Seeds have been Found 



to Germinate 7 



III. Days Required for Radicle to Appear when Seeds are 



Planted and Kept at the Temperatures Indicated . 7 



IV. Soil and Air Temperatures ...... 13 



V. Crop Needs for Water 24 



VI. Relation of Size of Tile and Fall to Capacity to Convey 



Water 86 



VII. Number of Acres from which One-fourth Inch of Water 

 will be Removed in Twenty-four Hours by Outlet 

 Tile Drains of Different Diameters and Different 



Lengths with Different Grades 89 



VIII. Form for Leveling Notes 102 



IX. Form for Leveling Notes 103 



X. Form for Leveling Notes ....... 105 



XI. Relation of Angle of Approach to Main to Distance be- 

 tween Laterals, when Laterals Enter Main 100 Feet 

 Apart . . . ... . . .111 



XII. Form for Field Notes . . . . . . .117 



XIII. Form for Field Notes with Distances, Back-sights and 



Fore-sights Introduced with Cheaper Levels . . 120 



XIV. Form for Field Notes with Distances, Back-sights and 



Fore-sights, Height of Instrument and One Elevation 



Introduced ... . . . . . 122 



XV. Same as Table XIII with Elevations Introduced . 124 



XVI. Same as Table XIII with Computations Completed . . 130 



