MANUAL OF NATURE STUDY. 
159 
function of different organs or tissues. Micro¬ 
scopic study should be pursued whenever it can be 
done to advantage and will aid to clearer compre¬ 
hension of physiological facts. Physics and 
chemistry, in so far as a knowledge of them is 
necessary to make clear the processes of Physi¬ 
ology, should be studied in connection with this 
subj ect. 
The following outline is suggestive for the work: 
I. Study the Framework of the Body — The Skeleton . 
( a ) Composed of bones and ligaments. Ar¬ 
ticulation of bones, the synovial fluid 
and its use. 
( b ) Structure, chemical composition and use 
of bones as levers. 
(^) Relation of their structure and proper¬ 
ties to their uses. Growth and repair 
of bones, effects of food, exercises, 
habits, etc. Care of the bones. 
II. The Muscles . 
(a) Structure and properties of muscular 
tissue, the voluntary and involuntary 
muscles and their arrangement. Ner¬ 
vous control of muscular action. 
(b) Changes that the muscle cells undergo 
during contraction, carbon dioxide, 
uric acid and other waste material, the 
oxidation of food substances, heat. 
