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CHAP. XVIII On the Polarizing Structure produced by Heat, Cold, Compression,

Dilatation, and Induration 197

1. Transient Influence of Heat and Cold ib.

(1.) Cylinders of Glass witl one positive Axis of Double

Refraction ib.

(2.) Cylinders of Glass with a negative Axis of Double

Refraction 198

(3.) Oval Plates of Glass with two Axes of Double Re- fraction ib

(4.) Cubes of Glass with Double Refraction 199

(5.) Rectangular Plates of Glass with Planes of no Double

Refraction ib.

(6.) Spheres of Glass, &c. with an infinite Number of

Axes of Double Refraction 201

(7.) Spheroids of Glass with one Axis of Double Refrac- tion along the Axis of Revolution and two Axes along the Equatorial Diameters ib.

(8.) Influence of Heat on regular Crystals 202

2. On the permanent Influence of sudden Cooling ib.

3. On the Influence of Compression and Dilatation 203

4. On the Influence of Induration 205

CHAP. XXIX.

Phenomena of Composite or Tesselated Crystals 206

CHAP. XXX On the Dichroism, or Double Color, of Bodies; and the Absorption

of Polarized Light 210

Colors of the two Images in Crystals with one Axis 21 1

Colors of the two Images in Crystals with two Axes 212

General Observatioas on Double Refraction 214

PART III.

ON THE APPLICATION OF OPTICAL PRINCIPLES TO THE EXPLANATION OF NATURAL PHENOiUENA.

CHAP. XXXI.

On unusual Refraction 215

CHAP. XXXII.

On the Rainbow

223

CHAP. XXXIII. On Halos, Corona*, Parhelia, and Paraselenne 227

CHAP. XXXIV On the Colors of Natural Bodies 235

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