glass has kindly been placed at the disposal of the Lund Observatory by
Mr. PICKERING, embraces all stars down to the 11th magnitude. It
consists of 55 plates, each embracing more than 900 square degrees of
the sky. The photographs were taken with a small lens of only 2.5 cms.
aperture and about 32.5 cms. focal-length. The time of exposure was one
hour. These plates have been counted at the Lund Observatory by Hans
HENIE. We return later to these counts.

The _FRANKLIN-ADAMS Charts_ were made by an amateur astronomer
FRANKLIN-ADAMS, partly at his own observatory (Mervel Hill) in England,
partly in Cape and Johannesburg, Transvaal, in the years 1905-1912. The
photographs were taken with a _Taylor_ lens with 25 cm. aperture and a
focal-length of 114 cm., which gives rather good images on a field of 15
x 15 square degrees.

The whole sky is here reproduced on, in all, 206 plates. Each plate was
exposed for 2 hours and 20 minutes and gives images of the stars down to
the 17th magnitude. The original plates are now at the observatory in
Greenwich. Some copies on paper have been made, of which the Lund
Observatory possesses one. It shows stars down to the 14th-15th
magnitudes and gives a splendid survey of the whole sky more complete,
indeed, than can be obtained, even for the north sky, by direct
observation of the heavens with any telescope at present accessible in
Sweden.

The F. A. C. have been counted by the astronomers of the Lund
Observatory, so that thus a complete count of the number of stars for
the whole heaven down to the 14th magnitude has been obtained. We shall
later have an opportunity of discussing the results of these counts.

A great star map is planned in connection with the Paris catalogue
mentioned in the preceding paragraph. This _Carte du Ciel_ (C. d. C.) is
still unfinished, but there seems to be a possibility that we shall one
day see this work carried to completion. It will embrace stars down to
the 14th magnitude and thus does not reach so far as the F. A. C., but
on the other hand is carried out on a considerably greater scale and
gives better images than F. A. C. and will therefore be of a great value
in the future, especially for the study of the proper motions of the
stars.

22. _Distance of the stars._ As the determination, from the annual
parallax, of the distances of the stars is very precarious if the
distance exceeds 5 sir. ([pi] = 0".04), it is only natural that the
catalogues o