Mattison, Hiram, 1811-1868 · New York, Huntington and Savage, Mason and Law · leaf 146
wn to be opake, from the fact that theysometimes exhibit phases, which show that they shineonly by reflection. 671. How are Comets usually distinguished one from another ? By the date of their appearance, or by a specificname given to them. [Thus we have the comets of 1585, 1680, 1811, &cEnckes… … It is the most dense orsolid portion, sometimescalled the head. (See Ein the cnt.) 674. What is the Envel-ope ?f A thin misty wrapper or covering surrounding the nucleus. (See E in the cut.) 675. What is the Tail of a Comet ? An expansion or elongation of the envelope, extend-ing off in one…
Astronomy
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