56 
LABORATORY EXERCISES 
IV. When the chest cavity is increased in size by the raising of 
the ribs and the contraction of the diaphragm, what causes the 
outer air to enter this cavity? Explain fully. 
EXERCISE 60 
INHERITED AND ACQUIRED CHARACTERISTICS 
Let each individual make his own lists according to the follow¬ 
ing directions. Be definite in listing these characteristics. For 
example — brown eyes rather than color of eyes. 
I. List the influences of your environment which you feel cer¬ 
tain have had a marked effect upon your life. 
II. List some of your personal characteristics which seem to 
have been inherited; some which you believe you have acquired; 
some which seem to be the result both of inheritance and of en¬ 
vironment. 
III. List some characteristics which you do not have and which 
you believe that no environmental influence could enable you to 
acquire. 
IV. Look over all the hereditary characteristics which you have 
mentioned. Check all those which appear frequently in your 
family. 
V. What statements which are made in your text does each of 
these lists illustrate? 
After each indivudal list has been completed, the class may be 
interested in discussing a number of them. (Among the char¬ 
acteristics which may be included in this study are eye color, color 
and character of hair, shape of nose, height, weight, peculiar mark¬ 
ings, special ability along certain lines, occupational tendencies, 
and temperament.) 
