THE BABBIT. 127 



may be seen. Insert the point of one blade of a pair 

 of strong scissors, or bone-forceps, at one side of the 

 spinal cord, and cut this side of the arch of the atlas ; 

 repeat with the other side, and continue thus through 

 several vertebrae, raising and turning them back. 

 Observe the coat which covers the spinal cord and 

 lines this canal in the backbone, the neural canal. 

 Note the groove along the center of the cord. 



2. Turn now to the head and insert one blade of the 

 bone-forceps at one side of the entrance of the spinal 

 cord into the skull. Cautiously cut and break away 

 the whole roof of the skull. This work may be done 

 with a strong knife, but the bone-forceps are best. 

 The tough membrane covering the brain and adher- 

 ing to the skull is the dura mater. 



3. The fore part of the brain is the cerebrum; observe 

 the groove separating it into the right and left hemi- 

 spheres. Observe the shape of the cerebrum, and the 

 general character of its surface. 



4. The prolongations of the cerebral hemispheres be- 

 tween the eyes are the olfactory lobes. 



5. Back of the cerebrum is the cerebellum. The partial 

 bony partition between them was probably noticed in 

 removing the roof of the skull. 



o. The part of the spinal cord within the skull is called 

 the medulla oblongata. Make a drawing of the 

 brain. If there be enough time, postpone 7 and 8 tilj 

 the completion of 9-17. Carefully cut away the 

 dura mater over the brain. 



7. Cut through the olfactory lobes at the front of the' 

 cerebral hemispheres, and carefully pry up the front 

 end of the cerebrum. Running forward and outward 



