Printed by T. and A. Constable, Printers to His Majesty,

at the Edinburgh University Press

[THE NEBULÆ AND CLUSTERS OF THE NORTHERN HEAVENS.]
Drawn upon an equal surface projection from Dr. DREYER'S catalogue of 1888.
The Milky Way from a Dr. BOEDDICKER'S Drawing.
By SIDNEY WATERS

[THE NEBULÆ AND CLUSTERS OF THE SOUTHERN HEAVENS.]
Drawn upon an equal surface projection from Dr. DREYER'S catalogue of 1888.
The Milky Way from URANOMETRIA ARGENTINA.
By SIDNEY WATERS

FOOTNOTES:

[1] In a letter to Knowledge, June 1903, Mr. W.H.T. Monck puts the same point in a mathematical form.

[2] Outlines of Astronomy, pp. 578-9. In the passages quoted the italics are Sir John Herschel's.