184 HEREDITY AND VARIATION 



Problem Questions 



1. What do we mean by variation? Heredity? 



2. Show how these factors work in plant or animal breeding. 



3. What is hybridization? 



4. Who is Luther Purbank and what has he done? 



5. Why should farmers select seeds with great care? 



6. What part of egg and of sperm cells has to do with heredity? 



7. Who was Mendel, and what is his law? 



8. What did De Vries do in the problem of heredity? 



9. What is meant by eugenics? 



10. What is meant by euthenics ? 



11. How might alcohol play a part in the problem of heredity? 

 (See Civic Biology, pages 289-294, 361-372.) 



12. What have clean thoughts to do with a clean body? 



Reference Books 



Hunter, Civic Biology, Chap. XVII. American Book Company. 



Hunter, Elements of Biology, pp. 80, 81. American Book Company. 



Hunter, Essentials of Biology, pp. 81, 83. American Book Company. 



Allen, Civics and Health. Ginn and Company. 



Bailey, Plant Breeding. The Macmillan Company. 



Bailey, Survival of the Unlike. The Macmillan Company. 



Barr, Mental Defectives. P. Blakiston's Son and Company. 



Bergen and Caldwell, Practical Botany, Chap. XXIII. Ginn and Company. 



Bigelow, Sex Instruction as a Phase of Social Education. American Medical Asso- 

 ciation, Chicago. 



Blatchford, Not Ouilty. Albert and Charles Boni. 



Blood Will Tell. Independent, July 27, 1914. 



Bulletins and educational pamphlets 1 to 6. Society of Sanitary and Moral Pro- 

 phylaxis. 



Campbell, Plant Life and Evolution. Henry Holt and Company. 



Castle, Heredity. D. Appleton and Company. 



Circulars 1^. Chicago Society of Social Hygiene. 



Conklin, Heredity and Environment. Princeton University Press. 



Coulter, Castle, East, Tower, and Davenport, Heredity and Eugenics. University 

 of Chicago Press. 



Darwin, On the Origin of Species by Natural Selection. D. Appleton and Company. 



Davenport, Domesticated Animals and Plants. Ginn and Company. 



Davenport, Heredity in Relation to Eugenics. Henry Holt and Company. 



Davenport, Principles of Breeding. Ginn and Company. 



Dawson, Right of the Child to be Well Born. Funk and Wagnalls Company. 



De Vries, Plant Breeding. Open Court Publishing Company. 



Duggall, The Jukes. G. P. Putnam's Sons. 



