xxii ILLUSTRATIONS 



214. The Gapeworm 511 



215. The Common Roundworm 511 



216. The Tapeworm 512 



217. A Typical Poultry Farm Layout 520 



218. Comparisonof Pre-war with War-time Conditions 531 



219. Increase and Percentage Distribution of Production Costs 532 



220. The Hen That Has Laid 535 



221. The Hen That Has Been a Poor Layer 535 



222. A High-Producing Leghorn 535 



223. A Low-Producing Leghorn 535 



224. A Hen Which Has Laid 261 Eggs During the Past Twelve Months . . . 536 



225. A Hen Which Has Laid 56 Eggs During the Past Twelve Months .... 536 



226. (A) This White Plymouth Rock Hen Laid 301 Eggs in 365 Consec- 



utive Days. (B) Here is an Exact Record of Her Performance . . . 537 



227. An Early Moulter. Changing Her Feathers in Early July 540 



228. A Typical Culhng Demonstration 541 



229. Egg Production rs. Certain External Characters 544 



230. CuUing Chart 546 



231. CulUngChart 546 



232. Correlation of Length of Rest Period to Production 547 



233. A Flock of Layers Under Lights in Mid-winter 552 



234. Types of Lanterns Used Where Electricity is not Available 553 



235. A Farm Unit Electric Lighting Plant 554 



236. One Method of Automatically Operating Ivights — Alarm Clocks . . . 555 



237. Another Method of Automatically Operating Lights — Time Clock 



and Switch 556 



238. Push-over Switch to Use with Alarm Clock 557 



239. Curve Showing what Lights Have Done 558 



24a Fowl with Points Named 560 



