Book Iv.--Autumn.

CHAP.

I. WHAT MAY BE SEEN IN THE HEAVENS:--

The Circle, and the uniform Movement of the Stars (according to the Theory of the Ancients destroyed by Kepler), 289

The Solar Constitution, 292

Result of recent Astronomical Researches, 296

II. WHAT MAY BE SEEN ON THE EARTH:--

Chemical action of Light, 312

Action of Heat, 313

Arable Land, 318

Mushrooms or Agarics, 325

The Number of Vegetable Species distributed over the whole Surface of the Globe, 337

The Harvest Bug, 349

The Cheese Mite, 354

The Number of Animal Species distributed over the whole Surface of the Globe, 356

What is Chlorophyll? 366

Carnations and Pinks, 371

The Eglantine and the Convolvulus, 379

Metamorphosis: a Physico-philosophical Meditation, 384

* * * * *

APPENDIX, 405