74 
LABORATORY EXERCISES 
the location of buildings, fences, alleys, and adjoining streets. On 
this map may be indicated with symbols the location of each 
possible breeding place for flies and for mosquitoes. Each group 
should study the nature of each situation, determine what might 
be done to prevent it from continuing as a possible breeding place 
for these insects, and prepare a report containing suggestions for 
the improvement of the conditions found. 
II. Conference. Each group may choose one of its number to 
report the results of its survey. Another member may report the 
suggestions of the committee for the improvement of conditions. 
The maps made by the various committees should be posted 
where they can be examined by each member of the class. 
III. Each pupil may write a short paper summarizing the 
conditions found in the survey and suggesting remedial measures. 
The best of these papers might be published in the school or local 
newspaper. 
EXERCISE 74 
INTERRELATIONS OF LIVING THINGS 
This project may vary according to conditions and the observa¬ 
tions may be entirely individual if it is deemed advisable. It 
should be begun in early spring and should be continued for a num¬ 
ber of weeks or throughout the spring. 
I. 1. You have heard the remark, “We have too many 
English sparrows about our homes.” Let us attempt to find out 
if this statement is true. Look up the history of the English 
sparrow’s introduction into this country. What are the objections 
to English sparrows? Observe those which you find about your 
homes. Read all that you can find regarding their habits. You 
may choose a specific problem, such as: 
a. Daily observations and records of the nest-building of Eng¬ 
lish sparrows. 
h. Observations and records of interference with other birds. 
