40 
LABORATORY EXERCISES 
occur, and that when the body resistance is low these germs secure 
a foothold most easily. Which of the “ causes ’’ that you have 
listed may have in some way lowered your body resistance? Which 
of them could have been avoided? What is essential to the main¬ 
tenance of a high degree of body resistance? Compare your state¬ 
ment of conditions with those conditions under which the athlete 
lives while in ‘‘ training.” 
3. List the treatments which were used as you did the causes.” 
Which of these treatments are in line with the most advanced 
scientific ideas regarding disease? Underhne them. From your 
study of “ patent medicines ” would you expect the patient who 
uses them to recover because of them or in spite of them? Why is 
the advice of a thoroughly trained physician desirable if drugs are 
to be used in the treatment of disease? 
4. Review the statements regarding disease which you have 
found in your text. Either summarize briefly those which you are 
willing to accept and which you expect to apply in your own case 
or write a short paper on the topic, “ How I can help myself to be 
a healthy individual.” 
III. Arrange all the material which you have collected or written 
in connection with this project in an orderly manner and bind it 
into booklet form. Appropriate covers may be designed for the 
booklet if so desired. 
EXERCISE 43 
BACTERIA — STRUCTURE 
I. Note the murky or cloudy appearance of water in which 
some substance has been decaying. To what is this appearance 
to be attributed? Examine a drop of the water which has been 
mounted under a high power of the microscope. Can you see any 
tiny objects, either moving or quiet? Describe any which you 
may see. 
II. Method of Staining Bacteria. 
1. Place a drop of water which contains the decaying substance 
upon a clean cover glass. Allow this to dry. Then pass the cover 
