Note 131 — PART IV. COMETS IN VARIOUS STAGES OF MATURITY.
Reading edition
“By the gradual increase of the distance of our Comet,” says Herschel, speaking of the Comet of 1807, “we have seen, that it assumed the semblance of a nebula; and it is certain, that had I met with it in one of my sweeps of the zones of the heavens, as it appeared on either of the days between the 6th December and the 21st February, it would have been put down in the list I have given of nebulæ.”