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COSMOS, VOL. II - World eBook Library

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CONTENTS. IX<br />

Page<br />

Polarization and interference of light<br />

715<br />

Measurable velocity of light<br />

716<br />

William Gilbert<br />

Edmund H alley<br />

717<br />

719<br />

Land and sea expeditions w 720<br />

Instruments for measuring heat 721<br />

The electric force 725<br />

Otto von Guericke 727<br />

Pneumatic chemistry<br />

728<br />

Geognostic phenomena<br />

732<br />

The charm inherent in mathematical studies 737<br />

V<strong>II</strong>I. Retrospect of the epochs considered 738-742<br />

Recapitulation<br />

738<br />

The power of penetrating space<br />

739<br />

Early gems of natural knowledge<br />

740<br />

The advance of various sciences . .. 741

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