Archelogia philosophica nova, or, New principles of philosophy containing philosophy in general, metaphysicks or ontology, dynamilogy or a discourse of power, religio philosophi or natural theology, physicks or natural philosophy / by Gideon Harvey ...

CHAP. XXI. Of Light.

• 1. VVhat Light is. The manner of the production of a Flame. p. 150.
• 2. The properties and effects of Light. p. 151.
• 3. That Light is an effect or conse∣quent of a Flame. Whence it hap∣pens that our Eyes strike fire when we hit our Foreheads against any hard Body. That Light is not a quality of fire alone. That Light is not fire rarefied. That where there is Light, there is not alwayes heat near to it. How Virginals and Or∣gans are made to play by them∣selves. p. 152, 153.
• 4. That Light is a continuous obdu∣ction of the Ayr. That Light is diffused to a far extent in an instant, and how. Why the whole tract of Air is not enlightned at once. p. 154, 155.
• 5. The manner of the Lights working upon the Eye-sight. That sight is actuated by reception, and not by emission. p. 156.
• 6. The reason of the difference between the extent of illumination and cale∣faction. That Light cannot be pre∣cipitated. ib.
• ...

• 7. That Light is not the mediate cause of all the Effects produced by the Stars. That Light hath only a pow∣er of acting immediately and per se upon the optick spirits. How the Air happens to burst through a sud∣den great light. That a sudden great Light may blind, kill, or cast a man into an Apoplexy. p. 157.
• 8. How Light renders all Objects visi∣ble. Why a peice of Money cast into a Basin filled with water appears bigger than it is. The causes of ap∣parent Colours. Why a great Object appears but small to one afar off. The difference between lux and lu∣men. What a Beam is. What a Splen∣dour is. That the Lights begot by the Stars, and other flames are not distinguished specie. How the Coe∣lum Empyreum is said to be Lu∣cid. p. 158, 159.