54 NATURAL RESOURCES OF HOME ENVIRONMENT 



limewater becomes milky in color. From former experi- 

 ments, it is evident that oxidation must be taking place in 

 our bodies. It would not require much of a stretch of one's 

 imagination to think out this whole process, and in this way 

 compare our own bodily machine to that of an engine. 

 Coal may be the source of power to drive the engine. In 

 the case of our bodily machine, what is it that corresponds 

 to the coal of the mechanical machine? 



Scoring my environment. The following score card is 

 a tentative project. We shall find much in the future chap- 

 ters of this book and its companion book on Civic Science in 

 the Community that may cause us later to wish to change 

 our score. You may think of other items to score that seem 

 more important to you. If so, make a score card of your 

 own. Modify any of the conditions here that you think 

 ought to be changed and bring your suggestions into class 

 as a problem for discussion. Get help at home where you 

 need it on this card and above all, try to be honest in 

 your estimates. Remember you do not cheat anybody 

 but yourself in a score which you know is incorrect. 



REFERENCE BOOKS 



Barber, First Course in General Science, Chapter II. Henry Holt and Company. 



Blackwelder and Barrows, Elements of Geology. American Book Company. 



Caldwell and Eikenberry, General Science, Chapters II, VI, VIII. Ginn and 

 Company. 



Clark, Introduction to Science, Chapter IV. American Book Company. 



Dorrance, The Story of the Forest. American Book Company. 



Hunter, Laboratory Problems in Civic Biology, Chapter II. American Book Com- 

 pany. 



Smith and Jewett, Introduction to the Study of Science, Chapter II. The Macmillan 

 Company. 



Trafton, Science of the Home and Community. The Macmillan Company. 



Van Buskirk and Smith, The Science of Everyday Life, Projects II, III, IV. Hough- 

 ton Mifflin Company. 



Weed, Chemistry in the Home, Chapters II, VII, IX. American Book Company. 



