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CHAPTER VII.

Newton's Hypothesis of Refraction and Reflexion Of Transparency and

Opacity~Hypothesis of Colours—The Spectrum supposed to be divided

like a Musical String-Incorrectness of this Speculation-Hooke's Oh-

servations on the Colours of Thin Plates explained by the vibrations pro-

duced in the Ether by the Luminous Corpuscles_Hooke claims this

Theory as contained in his Micrographia--Newton's Researches on the

Colours of Thin Plates-- Previous Observations of Boyle--Hooke's e.&

borate Experiments on these Colours-His Explanation of them- Dr.

Young's Observations upon them---Newton acknowledges his obligations

to Hooke_Newton's Analysis of the Colours seen between two Object-

Glasses-- Corrections of it by MM. Provostayes and Desains-New-

ton's Theory of Fits of easy Reflexion and Transmission--Singular

Phenomenon in the Fracture of a Quartz Crystal-Newton's Observations

on the Colours of Thick Plates_Recent Experiments on the same

subject,

151-174

CHAPTER VIII.

Influence of Colour in the Material World Newton's Theory of the

Colours of Natural Bodies-Coloured Bodies reflect only Light of their

own Colour, absorbing all the other parts of White Light--The Colours

of Natural Bodies are those of Thin Plates-The transparent parts re-

flecting one Colour and transmitting another --Arrangement of the

Colours exhibited in Natural Bodies into Seven Classes--Coloured Juices

and Solutions, Oxidated Films, Metals, &c. &c.-Newton's Theory appli-

cable only to one class of Colours Objections to it stated-Mr. Jamin's

Researches on the Colours of Metals-Cause of Colours must be in the

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APPENDIX TO VOLUME I.

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