Animals. 



99 



boring and wiring may be planned to be done in lesson- 

 time twice a week, and so there will be very little interfer- 

 ence with regular work. 



As to the preparation of skeletons of small animals, like 

 rats, squirrels, frogs, etc., the bones being too small to bore, 

 glue is used, but the specimen is too frail to stand long. 

 Another way is to boil very little and remove the flesh, but 



FIG. 29. SKELETON OF A DOG. 



keep the bones all united, leaving the cartilage to join the 

 bones. I have done this many times and I have had 

 success in this way. 



Another way is to soak the body in strong potash for two 

 days, then rinse and soak again in a weaker solution, repeat- 

 ing until the flesh is dissolved, and the whole skeleton will 

 come out intact. This method is used by naturalists gener- 



