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35 Many of the double stars exhibit a curious and beau- tiful contrast of colours. In such instances, the larger star is usually of a ruddy or orange hue, while the smaller one appears blue or green. “ It may he more easily suggested in words than conceived in imagination, what variety of illumination two suns —a red and a green, or a yellow and a blue one—must afford a planet circula- ting about either ; and what charming constrasts and grateful vicissitudes,—a red and a green day, for in- stance, alternating with a white one, and with darkness, -—might arise from the presence of one or another, or both, above the horizon .”—Sir J. F. W. Herschel. With a good telescope, several small cloudy ap- pearances may be discoverd in different parts of the heavens, having a faint, dusky light. These are clust- ers of stars too distant to be distinguished. Some of these Nebulas, as they are termed, are shown in DIAGRAM XXIX. The appearance termed the Milky Way, is occasioned by an immense number of stars situated at too great a distance from us to be seen distinctly without the aid of very powerful telescopes. Dr. Herschel counted 7200 stars in the field of view of his telescope, which compre- hended about 1-500,000th of the whole celestial he- misphere. The Milky Way is a nebula, which appears to us large and more distinct, on account of our prox- imity to it ; and with the whole of our starry firmament it will form a cluster, the form of which may be in some degree judged of by the arrangement which they exhibit to us. An imaginary view of this cluster, as it would be seen from the remoter nebula;, is shown in DIAGRAM XXX. of which the round figure shows a side view, and the other figure an end view. It is remarkable that among the most distant nebulae visible to us, there is actually one which seems like a copy of our own; presenting very