ILLUSTRATIONS xix 



85. Double-unit House Completed 131 



86. Working Plans of Small-unit Laying House 132 



87. Small-unit Laying House Completed 133 



88a, 6. Working Plans of Laying House with Two-thirds Span Roof 134-135 



89. Laying House with Two-thirds Span Roof 136 



90. Interior View of Two-thirds Span House 136 



91a. Working Plans of Half-monitor Laying House 137 



91&. Half-monitor Type of Laying House in Process of Construction 



and Nearing Completion 138 



92a. Working Plans of Portable Laying House 140 



926. Portable Colony Laying House Completed 141 



93. Arrangement of Nests, Perches, and Dropping Boards 144 



94. Roosting Closets to Prevent Drafts at Night 145 



95. Four Ways of Locating Nests 147 



96. Dark Wall Nests, Arranged in Tiers 148 



97. Coops for Broody Hens 148 



98. Pearl or Maine State Trap Nest 149 



99. Improved Connecticut Trap Nest 149 



100. The Cornell Trap Nest 150 



101. Common Types of Feeding Troughs 153 



102. A Home-made Dry-mash Hopper 154 



103. A Practical Drinking Fountain 155 



104. A Hopper for Grit and Shell 156 



105. A Group of Commercial Feeding Appliances 157 



106. A Good Method of Double Yarding and Crop Rotation 159 



107. Three Methods of Arranging Double Yards 161 



108. Forms for Making Concrete Fence Posts 162 



109. Manner of Bracing a Corner Fence Post 163 



110. A Common Type of Fence Construction 165 



111. Ways of Bracing Gate Posts 166 



112. Types of Gate Construction 167 



113. Graphic Representation of the Composition of the Bird's Body .... 170 



114. Cross Section of Wheat Kernel 188 



115. Rack for Sprouting Oats 189 



116. A Tray of Sprouted Oats Ready for Feeding 190 



117. Mangel-wurzel Beets at Harvest Time 199 



118. Poultry Feed House, Centrally Located 205 



119. The Poultry Feed Wagon 207 



120. Morphological Variation, Illustrated with Chicks 236 



121. Substantive Variations, Light and Dark Males 237 



122. M eristic Variation, Four-legged Chick 238 



123. Functional Variation, Eggs of Different Sizes 239 



124. Rumpless Birds, a Mutation 240 



125. Inbreeding Chart, Showing Distribution of Inherited Characters. . . 247 



126. Line Breeding Chart 249 



127. "Lady Lay More," a Wonderful Hen 253 



