at their
presence could only be recognized by the formation of a halo around the
moon."

"These clouds sometimes range themselves _even by day_ in a similar
manner to the beams of the aurora and then disturb the course of the
magnetic needle in the same manner as the latter. On the morning after
every distinct nocturnal aurora the same superimposed strata of clouds
have still been observed, that had previously been luminous."

PARRY even "saw the great arch of the northern light _continue
throughout the day_."

"ARAGO was of the opinion that each observer saw his own aurora somewhat
as each observer of a rainbow sees the luminous arc differently placed."

_The Great Sun Battery._

10. (Page 44.) If with a percussion cap and a tear we may develop
sufficient power to deflect a magnetic needle 3,000 miles distant, what
power may not be expected of the sun, 1,250,000 times larger than the
earth; the sun exercising a force of the same character?

_Gravity._

11. (Page 50.) "PROF. MOSSOTTI has recently shown, by a very able
analysis, that there are strong grounds for believing that not only the
molecular forces which unite the particles of material bodies depend on
the electric fluid, but that even gravitation itself, which binds world
to world, and sun to sun, can no longer be regarded as an ultimate
principle, but the residual portion of a far more powerful force,
generated by that energetic agent which pervades creation."--FARADAY.

"If gravitation is made to mean something allied to magnetism, some
poorly explained phenomena become easily understood. But what are the
circumstances affording proof of the identity of these forces? First,
gravitation acts upon all kinds of matter; FARADAY proved the same of
magnetism. Second, gravitation is attractive; so is magnetism. Third,
gravitation is proportionate to the mass; the force of magnets also
depends upon the mass. Fourth, gravitation acts in an inverse ratio to
the square of the distance; so does magnetism. Fifth, gravitation does
not manifest polarity; magnetism is known not to do so. Sixth,
gravitation acts independently of bodies affording a resistance to light
and heat; so does magnetism."--CARTWELL.

FARADAY'S biographer says:--"He is oppressed with the magnitude and
importance of his subject, yet is stimulated by the fact that the
discovery which he aims for (the relationship between gravity and
elect