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CARTILAGE. 139
expansion and contraction of the chest necessary to breathing, and
those within the walls of the air-passages prevent closnre of the tubes
when they are flexed.
Histologists divide cartilage into two parts—the cartilage-cell and
the hyaline or intercellular substance or matrix.
Cartilage is also divided into three kinds, according to the chai'acter
of the matrix—hyaline cartilage, fibro-cartilage, and iibro-elastic carti-
lage.
HyaUne Cartilage is so named from its resemblance to glass. It
is firm, homogeneous, and more or less transparent according to thick-
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