40 BULLETIN 521, U. S. DEPARTMENT OF AGRICULTURE. 
Pkacticum 2. — Judging Bacon Hogs. 
Lesson 3. — Breeds of Swine. 
1. The Berkshire. 
(a) Characteristics and utility. 
(6) Origin and history. 
(c) The Berkshire in the United States. 
(Same outline for all important breeds of swine.) 
2. The Poland China. 
Lesson 4. — Breeds of Swine — Continued. 
1. Chester White. 
2. Duroc Jersey. 
Lesson 5. — Breeds of Swine — Continued. 
1. Hampshire. 
2. Tamworth. 
3. Large Yorkshire. 
4. Any of the following breeds or others which may be of local importance : 
Small and middle Yorkshire, Mulefoot, Cheshire, Yictoria, Essex. 
Lesson 6. — Market Classes and Grades of Swine. 
1. The swine market. 
2. Grades of swine. 
3. Swine products. 
Special reference : Judging Swine as a Subject of Instruction in Secondary 
Schools, Agricultural Education Monthly, Vol. II, No. 7. 
Practicums 3 and 4. — Judging Swine. 
improvement of animals. 
(Five lessons.) 
References. — 
Principles of Breeding and Origin of Domesticated Breeds of Animals, 
Separate from Twenty-seventh Report of Bureau of Animal Industry, 
1910. 
Lesson 1. — Variation in Animals. 
1. Law of variation. 
2. Sports and mutations. 
3. Selection. 
(a) Natural. 
(6) Artificial. 
Lesson 2. — Heredity. 
1. Law compared with variation. 
2. Mendel's law. 
3. Cross breeding versus pure breeding. 
Lesson 3. — Prepotency. 
1. Value in breeding. 
(cr) Prepotent individuals. 
2. A study of pedigrees. 
3. Registration of animals. 
Lesson 4. — Practical Problems in Breeding. 
1. Increasing variation. 
2. Selection according to ideals. 
3. Testing hereditary power. 
