Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 411
the headof the comet and the continual formation of new ones in the im-mediate neighborhood of the nucleus, they would seem to be dueto a process of evaporation going on from the surface of the latter.Each layer of vapor thus formed rises up and spreads out con-tinually until the part next the sun… … Fig. 104.—formation of comets tail. These phenomena were fully observed in the great comet of1858, the observations of which were carefully collected by thelate Professor Bond, of Cambridge. The envelopes of this cometwere first noticed on September 20th, when the outer one was 16above the nucleus…
Astronomy
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