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52 MACROSCOPIC ANATOMY OF THE HUMAN TEETH.

The SANGUiNEO-iuiJOiis has teeth whicli arc Xay^o, with strong; edges
and hirge cusps ; color dark yellow, and quality good.
The NERVO-BiLious has teeth that are long and narrow, with l<^ng
cusps ; color yellowish or bluish or both combined ; the enamel strong,
the dentin soft.
The i.YMPiio-BiLious has teeth that are large, with thick edges and
short thick cusps yellowish in color ; enamel of good structure and
;
polish, and dentin fair.
The BiLio-SAN(JUiNE()US has teeth of average size, round arch, well-
developed cusps and edges ; ri(;h dark-cream color ; excellent in (piality.
The NERVO-SANGUINEOUS has teeth of average size, good shape, round
arch, good edges and cusps ; rich cream color ; enamel and dentin of
excellent structure.
The LYMPHO-SANGUINEOUS has teeth of more than average size,
shapely edges and cusjjs, rounded arch ; color grayish cream ; enamel
and dentin fairly good.
The BiLio-NERVOUS lias teeth variable in size and form, sometimes,
broad, again very long with more pointed and long cusps ; the color
generally bluish ; enamel fairly good, dentin soft and sensitive.
The SANGUINEO-NERVOUS has teeth of average size, good shape,
round arch ; color grayish blue ; soft and frail.
The BiLio-LYMPHATic has teeth usually large, with thick edges,
short thick cusps, and flat arch ; color yellowish ; quality good.
The SANGUiNEO-LYMPHATic lias teeth of more than the average size,
broad round arch ; color gray ; enamel and dentin poor.
The NERVO-LYMPHATic lias teeth of average size, good shape, aver-
age length, rather round arch ; color bluish gray ; soft and poor.
Combinations of the binary temperaments are of the most common
occurrence in individuals, but there is usually one basal temperament
that preponderates over the others and gives its characteristic to the
teeth as a predominating influence.
(4) Under the fourth head, patholog-ical lesions, are to be included
all those disturbances of nutrition which eventuate in faulty formation
of the teeth, whether due to specific hereditary diseases, mere malnutri-
tion, idiosyncrasies, predispositions, defective functional life, etc. But
this leads beyond the province of this chapter into the field of special
pathology.