Vlll TABLE OF CONTEKTS. 



PAGE 



Amount of Soil Ingredients Withdrawn by Various Crops 150 



Amount of Fertilizing Materials Contained in Different Crops 



Grown on One Acre 151 



Farmyard Manure Required to Replace Ingredients Abstracted 



from the Sr)il by an Acre of Different Crops 152 



Amount and Quality of Manure Produced by Sto'.x 152 



Composition, Amount, and Value of Manure Produced by Differ- 

 ent Kinds of Farm Animals 153 



Quantities of Nitrogen and Ash Constituents Voided by Animals. . 153 



Percentage Composition of Commercial Fertilizing Materials 154 



Exhaustion of Fertilizers 156 



Equivalent Quantities of Fertilizing Materials 157 



Proportion of Plant Food Recommended for Crops is8 



Valuation of Manures and Fertilizers 158 



Trade Values of Fertilizing Ingredients in Raw Materials and 



Chemicals, 1 908 159 



Conversion Table for Calculating Fertilizing Ingredients 160 



Prices of Nitrate of Soda on the Ammoniate Basis 160 



XI. AGRICULTURAL ENGINEERING. 



Drainage: Reasons for Tile-draining Land 161 



Number of Rods and of Tiles per Acre, with Drains at Various 



Distances Apart 162 



Size of Tiles Required for Draining under Average Conditions. . 162 



Table of Size of Tile Pipe of Main Drain 163 



Rule for Obtaining Size of Main Pipes 163 



Number of Acres which a Tile of a Given Diameter and Per Cent 



Grade will Drain when Used as an Outlet 164 



Number of Acres Drained by Tiles Removing i in. Depth of 



Water in Twenty-four Hours 165 



Number of Acres Drained by Open Ditches. 166 



Advice to Land Owners About to Construct Drains 168 



Points to Note in Planning a Drainage System 169 



Sizes of Drain-pipe Required for Culverts in Proportion to 



Capacity and Fall 169 



Areas from which i in. of Water will be Removed in Twenty-four 

 Hours by Outlet Tile Drains of Different Diameters and 



Lengths with Different Grades 170 



Rise of the Slipe for 100 Feet 171 



Quantity of Earth Removed per Rod of Drains of Various Dimen- 

 sions 171 



Limit of Size of Tile to Grade and Length 172 



Rainfall. , 172 



Windmills: Table Showing the Force and Velocity of Wind 173 



Number of Square Feet and Acres Irrigated by Windmills of 



Different Sizes. 173 



Table Showing Capacity of Windmills .'.... 174 



Table Showing Economy of Windmills 175 



Nonninal Horse-power Required for the Discharge of Given 



Quantities of Water with Lifts of 10 and 20 Ft 176 



