-181, 293-321;
_same_, LXXI., 1809, pp. 5-40.

Observations on the nature of the new celestial body [_Vesta_]
discovered by Dr. OLBERS, and of the comet which was expected to appear
last January in its return from the sun. [1806, II.]
_Phil. Trans._, 1807, pp. 260-266.

Observations of a comet [1807, I.] made with a view to investigate its
magnitude and the nature of its illumination, to which is added an
account of a new irregularity lately perceived in the apparent figure of
the planet _Saturn_.
_Phil. Trans._, 1808, pp. 145-163.
_Gilbert Annal._, XXXVI. (1810), pp. 389-393.
_Zach, Monat. Corresp._, XX. (1809), pp. 512-514.

Continuation of experiments for investigating the cause of colored
concentric rings and other appearances of a similar nature.
_Phil. Trans._, 1809, pp. 259-302.

Supplement to the first and second part of the paper of experiments for
investigating the cause of colored concentric rings between
object-glasses, and other appearances of a similar nature.
_Phil. Trans._, 1810, pp. 149-177.
_Gilbert Annal._, XLVI., 1814, pp. 22-79.

Astronomical observations relating to the construction of the heavens,
arranged for the purpose of a critical examination, the result of which
appears to throw some new light upon the organization of the celestial
bodies.
_Phil. Trans._, 1811, pp. 269-336.
_Journ. de Phys._, LXXV., 1812, pp. 121-167.

Observations of a comet, with remarks on the construction of its
different parts [1811, I.].
_Phil. Trans._, 1812, pp. 115-143.
_Journ. de Phys._, LXXVII., 1813, pp. 125-135.
_Zach, Monat. Corresp._, XXVIII., 1813, pp. 455-469, 558-568.
_Bode's Jahrbuch_, 1816, p. 185.

Observations of a second comet, with remarks on its construction
[1811, II.].
_Phil. Trans._, 1812, pp. 229-237.
_Nicholson Journ._, XXXV., 1813, pp. 193-199.
_Bode's Jahrbuch_, 1816, p. 203.

Astronomical observations relating to the sidereal part of the heavens,
and its connection with the nebulous part, arranged for the purpose of a
critical examination.
_Phil. Trans._