geegg] 



HYGIENE AS X ATI' RE STUDY 



221 



the bottle all that can possibly be exhaled. Subtracting the first of 

 these measurements from the original measurement (vital capac- 

 ity) the pupils complemental capacity is gotten. Subtracting the 

 second of these measurements (supplemental capacity) from the 

 first of these measurements, the pupil's tidal or common breath- 

 ing capacity is obtained. 



The occompanying illustration will help to make all these 

 matters clearer. 



9eu.iffch«i 



Lune CQptkQi't iet andSfses 



ytt i^reaie^t e-'pircshon 



A record of each pupils capacities should be posted in an 

 appropriate place. 



3. Suggested Additional Experiments. 



