SOME REACTIONS AMONG ANIMALS 161 



10. What is the life history of the liver fluke ? 



11. Why is the hookworm the most common among the 

 poor and ignorant ? 



12. Name the best means of preventing hookworm disease. 



13. Where are the hookworm regions of the United 

 States? How were the worms probably introduced into this 

 country ? 



14. Why have the poor whites of the South obtained the 

 reputation of being lazy and without ambition ? 



15. Why is the hookworm disease so prevalent in Porto 

 Rico? 



10. How prevent infection from tapeworms and trichinae ? 



17. Give the life history of the tapeworm. 



18. What is the effect on man of the lack of self-dependence ? 



Special Reports 



1. Symbiosis or commensalism. 



2. Parasitism and degeneration. 



3. The hookworm and means of fighting it. 



4. Communal life amongst animals. 



5. Human degeneration. 



6. Tapeworms and their hosts. 



7. The life history of the trichina. 



8. The federal government meat inspection service. 



References 



Hunter, Essentials of Biology. Chap. XVII. 

 Elements of Biology, pp. 213-214. 



Melvin, A. D., "The Federal Meat Inspection Service." U. S. Depart- 

 ment of Agriculture, Circular 125, 1908. 



Hickman, J. Fremont, "Stomach Worms in Sheep." Bulletin 117, 

 Ohio Agricultural Experiment Station, 1900. 



" Regulations Governing the Meat Inspection Service of the United 

 States." Order Bulletin 150, U. S. Department of Agriculture, 1908. 



Ransom, B. H., "Trichinosis: a Danger in the Use of Raw Pork for 

 Food." Circular 198, U. S. Department of Agriculture, 1907. 



Bjorkman, Francis M., "The Cure for Two Million Sick." (Hook- 

 worm.) World's Work, May, 1909. 



SHARPE'S LAB. MAN. 11 



