te of metals when applied to the tongue? 873. What is the
primary use of taste? Where do we see it perverted? 874. How is this
sense in children? What is true of every person in reference to
taste?

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_Observation._ This sense has been made to vary more than any other by
the refinements of social life. Thus, the Indian's like or dislike to
particular kinds of food, generally extends to every person of the
same tribe; but among civilized men, no two individuals can be found
alike in all their tastes.

875. This sense is modified by habit, and not unfrequently those
articles, which at first were disgusting, become highly agreeable by
persevering in the use of them. By cultivation, this sense may be made
very acute. Those persons whose business leads them to judge of the
quality of an article by their taste, can discriminate shades of
flavor not perceivable by ordinary persons. Epicures, and tasters of
wines and teas, afford examples.

_Observation._ Many persons impair their taste by bad habits, as
chewing and smoking tobacco, and using stimulating drinks, and pungent
condiments with the food. These indulgences lessen the sensibility of
the nerve, and destroy the natural relish for food.

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What is true of the Indian? 875. Is this sense modified by habit? Give
instances. How is this sense sometimes impaired?

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CHAPTER XLIII.

SENSE OF SMELL.

876. This sense is located in the air-passages of the _Nose_. To
understand the function of smell, the structure of the nose and nasal
cavities, with the distribution of the olfactory nerves, must be first
examined.

ANATOMY OF THE ORGANS OF SMELL.

877. The NOSE is composed of the _Bones_, _Fi'bro-car'tilages_, and
_Mu'cous Mem'brane_, together with its integuments.

878. The BONES of the nose are the nasal, and the nasal processes of
the upper jaw.

879. The FIBRO-CARTILAGES give form and stability to the framework of
the nose, providing at the same time, by their elasticity, against
injuries. They are five in number.

880. The MUCOUS MEMBRANE, which lines the interior of the nose, is
continuous with the skin externally, and with the lining membrane of
the parts of the throat. The entrance of the nostrils is provided with
numerous hairs, which serve as guardians to the delicate membrane of
the nose.

881. The NASAL FOSSAE, or nostrils, are two irregular, compressed
cavit