Fig. 45 (by Vogel, at Bothkamp) represents another of these numerous types. The extraordinary Fig. 46 is from another drawing, by Tacchini, of a protuberance seen in 1871 (a time of great solar disturbance), and it belongs to the more energetic of its class. [Illustration: FIG. 47.--ERUPTIVE PROMINENCES. (“THE SUN,” BY YOUNG.)] This fantastic cloud-shape, “if shape it might be called that shape had none,” looking like some nightmare vision, was about fifty thousand miles long and sixty thousand high above the surface. The reader will notice also the fiery rain, like the drops from a falling rocket, and may add to it all, in imagination, the actual color, which is of a deep scarlet. It may add to the-interest such things excite, to know that they have some mysterious connection with a terrestrial phenomenon,--the aurora,--for the northern lights have been again and again noticed to dance in company with these solar displays. The eruptive prominences are very different in appearance, as will be seen by the next illustration, for which we are indebted to Professor Young. In Fig. 47 we have a group of most interesting views by him (drawn here on the common scale of seventy-five thousand miles to an inch), illustrating the more eruptive types, of which we will let him speak directly. The first shows a case of the vertical filaments, like those rocket-drops we saw just, now in Tacchini’s drawing, but here more marked; while the second (on the left side) is a cyclone-form, where the twisted stems suggest what we have seen before in the “bridges” of sun-spots, and below this is another example of filamentary forms. The upper one, on the right, is the view of a cloud prominence as it appeared at _half-past twelve_ o’clock, on Sept. 7, 1871. Below it is the same prominence at _one_ o’clock (half an hour later), when it has been shattered by some inconceivable explosion, blowing it into fragments, and driving the hydrogen to a height of two hundred thousand miles. The lowest figure on the right shows another case where inclined jets (of hydrogen) were seen to rise to a height of fifty thousand miles. Professor Young says of these:--