The Astrophysical journal . t bend somewhat down-ward as they cross the outer dark ring, then rise up again on thebrighter ring, and lastly, on reaching the edge of the nucleus, beginto rush downward, apparently along a descending slope, and growthinner and fainter as they gradually melt into it. As far as I canunderstand a drawing, these would show precisely the same formand bending which strike me when I consider the lines of the filaments. This therefore seems to give strong support to the opinion that thedark nucleus is a hole in the photosphere; not, of course, a vacuum, buta hole filled
The Astrophysical journal . t bend somewhat down-ward as they cross the outer dark ring, then rise up again on thebrighter ring, and lastly, on reaching the edge of the nucleus, beginto rush downward, apparently along a descending slope, and growthinner and fainter as they gradually melt into it. As far as I canunderstand a drawing, these would show precisely the same formand bending which strike me when I consider the lines of the filaments. This therefore seems to give strong support to the opinion that thedark nucleus is a hole in the photosphere; not, of course, a vacuum, buta hole filled up with materials which must be at the same time oflighter density and less brilliancy. The lighter density is shown bythe fact that the filaments bend down into it, while on a fluid ofgreater density they would run upward. I do not intend in any way to construct a theory of sun-spots, butonly to point out what seems to be represented in these interestingphotographs. Z6-SE Observatory, near Shanghai,March 22, 1907 PLATE XVI. September 14, 1906. 1 mm=o?6, nearly. Minor Contributions and Notes ON THE VELOCITY OF METALLIC PARTICLES IN THESPARK DISCHARGE The Astrophysical Journal for January 1907 contains a paper byProfessor G. F. Hull in which certain experiments made by and myself1 are referred to, and their explanation as givenby us is called in question. Professor Hulls results have alreadybeen quoted as invalidating our conclusions; it seems therefore worthwhile pointing out that there is no real connection between the twosets of experiments. Our work led to the measurement of the veloci-ties of metallic particles under certain conditions in a spark, andProfessor Hull failed in his discharges to obtain a displacement oflines corresponding to these velocities; but our paper, as far as Iknow, contains no sentence which could have led anyone to expect aDoppler effect under the conditions under which Professor Hull experi-mented, and the fact that no displacement of l
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