of large apertures and high
magnifying powers.
_Phil. Trans._, 1800, pp. 255-283.
_Bode's Jahrbuch_, 1804, p. 89.

Experiments on the refrangibility of the invisible rays of the sun.
_Phil. Trans._, 1800, pp. 284-292.
_Bode's Jahrbuch_, 1804, p. 89.

Experiments on the solar and on the terrestrial rays that occasion heat,
with a comparative view of the laws by which light and heat, or rather
the rays that occasion them, are subject, in order to determine whether
they are the same or different.
_Phil. Trans._, 1800, pp. 293-326, 437-538.
_Gilbert Annal._, X. (1802), pp. 68-78;
_same_, XII. (1803), pp. 521-546.

Observations tending to investigate the nature of the sun, in order to
find the causes or symptoms of its variable emission of light and heat,
with remarks on the use that may possibly be drawn from solar
observations.
_Phil. Trans._, 1801, pp. 265-318.
_Bode's Jahrbuch_, 1805, p. 218, and 1806, p. 113.

Ueber den 7 Nebelfleck der 1sten classe des Herschel'schen Verzeichniss,
und ueber _Ceres_ und _Pallas_, vom Herrn Doctor HERSCHEL, aus zwey
Briefen desselben.
_Bode's Jahrbuch_, 1805, p. 211.

Additional observations tending to investigate the symptoms of the
variable emission of the light and heat of the sun, with trials to set
aside darkening glasses by transmitting the solar rays through liquids,
and a few remarks to remove objections that might be made against some
of the arguments contained in the former paper.
_Phil. Trans._, 1801, pp. 354-362.

Observations on the two lately discovered celestial bodies
[_Ceres and Pallas_].
_Phil. Trans._, 1802, pp. 213-232.
_Nicholson Journal_, IV. (1808), pp. 120-130, 142-148.

Catalogue of five hundred new nebulae, nebulous stars, planetary nebulae,
and clusters of stars, with remarks on the construction of the heavens.
_Phil. Trans._, 1802, pp. 477-528.
_Bode's Jahrbuch_, 1807, p. 113.

Observations of the transit of _Mercury_ over the sun's disk, to which
is added an investigation of the causes which often prevent the proper
action o