lar hypothesis--The sun
cool, luminous, and habitable--Celestial spectroscopy--Undulatory
theories ignored--Light instantaneously transmitted--Telephone--No light
nor heat wasted--Extent of the atmosphere of the spheres--The sun's
power overestimated.

CHAPTER XIII.

INFLUENCE OF THE FORCES AS CAUSATION OF DISEASE . . . . . . . . . 84

Meteorological influence--Higher appreciation of the source of disease,
and increased efficiency in its treatment.

CHAPTER XIV.

THE ARTIFICIAL PRODUCTION OF LIGHT, HEAT, AND POWER, AND THEIR
UTILIZATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

CHAPTER XV.

WHY WAS NOT THIS DISCOVERY SOONER MADE? . . . . . . . . . . . . . 90

Its consummation nearly perfected by many others--Its successful
accomplishment plainly foretold by Faraday.

APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

ILLUSTRATIONS.

PAGE
I.--THE SOLAR CONE, OR CONE-SPACE . . . . . . . . . . . . . . . 30

II.--THE SEASONS. SUMMER . . . . . . . . . . . . . . . . . . . . 48

III.-- " " WINTER . . . . . . . . . . . . . . . . . . . . 49

IV.--MANUFACTURED WIND. (From DESCHANEL'S Natural Philosophy) . . 66

"If we suppose the sun and fixed stars to be gigantic
fountains of magnetic influence, acting upon our globe and
its atmosphere, and likewise upon all the other planets, the
phenomena of the universe would then become susceptible of
the grandest and simplest interpretations."--CROSSLAND.

"Are not the sun and fixed stars great earths vehemently
hot?"--NEWTON.

"Herschel's fixed idea was that the darkness of a spot upon
the sun was an indication of a cool and habitable
globe."--HUMBOLDT.

"The sun as the main source of light and heat must be able
to call forth and animate magnetic forces on our
planet."--_Ibid._

THE

GREAT PHYSICAL FORCES.

CHAPTER I.

INTRODUCTORY.

_The Sun._

The sun's position in the great field of energy is daily becoming more
exalted in the estimation of philosophic minds. His labors are being
revealed to us with a distinctness never before conceived. He it is that
sto