MANUAIy OF NATURE STUDY. 
21 
c. Hearing .—Compare the outer ear of children 
with that of horse, rabbit, dog, cat, and determine 
which is most sensitive. Is it necessary to keep 
the ear clean? Does it ever injure the ear to take 
cold? Is the wax of any use to the ear? Are the 
hairs in the ear of any use ? Look in the horse’s 
ear for hairs. In the dog’s, the cat’s. Where is 
the bird’s ear ? What do we learn by means of our 
ears ? By means of our eyes ? Our fingers ? 
d. Smell .—Name of organ, nostrils. Compare 
with the same in horse, in dog, in cat, in hen, and 
determine which is the most sensitive. What 
pleasure do we get from the sense of smell ? Why 
should the organ of smell be placed so close to the 
mouth? Will a cold in the head injure the sense of 
smell ? How ? Should we breathe through the nose 
rather than the mouth ? Why ? Would a severe 
cold prevent us from breathing through the nose ? 
Draw the conclusion that it is best to avoid taking 
cold. 
e. Taste may be dealt with in same way. 
Discuss relative values of these senses, as to which 
is most important, which least, etc. 
2.—The Skin. 
Review the skin or rind of the apple, the peach, 
the plum, and grapes as to protection. Also the 
