D. Trowbridge on the Nebular Hypothesis. 359 
to the last."* But since the mass of the largest of the rings in 
our system is but a small fraction of the mass of the sun, the 
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atively less of such materials than the inner ones? Accor ing 
to this view, the sun should possess comparatively more metals 
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length of time? and would he not be more intensely lumin- 
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around the sun in the same direction. 
_» Solar spheroid, it might depart in either extreme of distance 
rom the approximate law. Such, at least, seems probable. __ 
ie am unable to see sufficient evidence of the synchronous formation of the plan- 
dvocated Prof. Kirkwood, I believe, by Prof. Alexander. 
its to each other, and to the solar equator, I 
furnish evidence against it, Prof. Hinrichs finds evidence of the successive 
