LABORATORY EXERCISES. 



2. Test a small portion of this " soup-stock 

 for nutrients. (Experiments 8-J3.) 



32. CLASSIFICATION OF BONES. 



From the articulated skeleton make lists of 



1. Long bones (distinguished by shaft and ar- 



ticular extremities or heads). 



2. Short bones (more or less cubical in shape). 



3. Tabular or flat bones (flat like rib and with 



no marrow cavity). 



4. Irregular bones (all others). 



33. STUDY OF THE MUSCLES. 



Definitions. 



1. The part of the muscle which contracts is 



the belly; the bands or cords at the ends 

 are the tendons. 



2. The end of the muscle, that is, the tendon, 



which moves least is called the origin; the 

 tendon which moves most, the insertion. 



3. Muscles which bend or flex the limb are 



called flexors; muscles which straighten 

 or extend the limb, extensors. 

 A. The biceps muscle (a flexor muscle). 



i. Clasp the front of the right upper arm with 

 the left hand; draw up or flex the right 

 forearm as far as possible. What 

 changes do you notice in the belly of the 

 muscle ? 



