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The history of silk, cotton, linen, wool, and other fibrous ... - Cd3wd.com

The history of silk, cotton, linen, wool, and other fibrous ... - Cd3wd.com

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SILKEN MATERIAL OF THE SPIDER. 139<br />

<strong>and</strong> shoulders. <strong>The</strong>y breathe by leaf-shaped gills, situated un-<br />

der the bell}', instead <strong>of</strong> spiracles in the sides ; <strong>and</strong> have a heart<br />

connected with these. But as spiders are popularly considered<br />

insects, it will sufficiently suit our purpose to introduce them<br />

here as such.<br />

Spiders are usually classed according to their difference <strong>of</strong><br />

color, whether black, brown, yellow,

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