228 



LIFE ON THE EARTH 



decide whether the methods used are the most effective 

 ones. If possible, bring to class for further study some 

 specimens of the insects or diseases at work. 



REFERENCES FOR FURTHER STUDY 



Texts 



Caldwell and Curtis, Science for Today, Chap. 31 

 Clement, Collister, and Thurston, Our Surroundings, Chap. 36 

 Hunter and Whitman, Science in Our World of Progress, 



Unit 16 

 Lake; Harley, and Welton, Exploring the World of Science, 



Chap. 33 

 Pieper and Beauchamp, Everyday Problems in Science, Unit 



7 

 Powers, Neuner, and Bruner, The World around Us, Units 2, 



8; Man's Control of His Environment, Chap. 9 

 Watkins and Bedell, General Science for Today, Chap. 29 

 Wood and Carpenter, Our Environment: How We Use and 



Control It, Unit 7 



Special references 



Atwood, Civic and Economic Biology 



Doane, Infects and Disease 



Howard, The House Fly 



Hunter, A Civic Biology 



Ritchie, Primer of Sanitation and Physiology 



U. S. Dept. of Agriculture, Farmers' Bulletin, 459 and 851 



WHAT YOU SHOULD AIM TO ACQUIRE FROM 

 THIS STUDY 



1. A knowledge of the common destructive insect 

 pests. 



2. The methods used to exterminate household 

 pests. 



3. The reasons why the house fly is our most dan- 

 gerous household pest. 



4. The life history of the house fly and of the mos- 

 quito. 



5. The destructive work of rats and the best ways 

 to eliminate them. 



6. A knowledge of how to combat animals that de- 

 stroy our food and clothing. 



TEST OF MASTERY OF THE TOPIC 



In your notebook complete the statements, answer the 

 questions, and comply with the instructions. 



1. List all the animal pests you know and state briefly 

 the ways in which each is a pest. 



2. The four stages in the life history of a fly are 



3. The larva of a fly is called a . 



4. House flies lay their eggs in 



5. The mosquito that carries malaria germs is called 



6. The larva of a mosquito is called 



7. Mosquitoes lay their eggs on 



8. The best way to get rid of flies is by 



9. The best way to eliminate mosquitoes is 



10. Flies have been found to be carriers of the germs 

 which cause the disease . 



11. Clothes moths can be kept from destroying clothing 

 by. 



12. The best methods by which to get rid of rats and mice 



13. Write a paragraph on the topic, "The Rat, Our 

 National Pest." 



TOPIC 3. THE ORIGIN AND DEVELOPMENT OF LIVING THINGS 



SUGGESTED PROBLEMS AND QUESTIONS 



1. What are living things made of? 



2. What is the nature of cells, tissues, and or- 

 gans? 



3. Does life always come from life? 



4. What is the structure and function of a 

 flower? 



5. How are seeds formed? 



6. What is pollination? How many different 

 agencies of pollination are there? 



7. Do higher animals reproduce in a manner 

 similar to flowering plants? 



SUGGESTIONS AND HELPS FOR STUDY 



1. Think over each problem carefully to see if you 

 have any information about it already ; then proceed 

 to secure further material from the suggested refer- 

 ence studies. 



2. It is easy to raise one-celled animals and yeast 

 plants in the classroom, where their methods of repro- 

 ducing may be observed through a microscope. 



3. In the spring of the year female frogs and toads 

 deposit their eggs in ponds. These eggs are easy to 

 find and can be kept in an aquarium where their de- 

 velopment can be observed. 



4. The following words may be new and difficult 

 for you. Study them carefully. 



protoplasm the living matter of plant and animal cells. 

 nucleus the denser portion of a cell, usually in the 

 central part. 



EXPERIMENTS OR DEMONSTRATIONS WHICH WILL 

 HELP ANSWER THE PROBLEM QUESTIONS 1 



Experiment 140. How do tiny one-celled animals re- 

 produce? 



Place a handful of hay in a jar of water and keep the 

 jar in a warm place. After several days mount on a slide 



1 See workbook, p. 82. 



