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Thus the comet predicted by Klinkerfues and discovered by Pogson had already lagged to the extent of twelve weeks, and we shall meet instances farther on where the retardation is counted, not by weeks, but by years. Here original identity emerges only from calculation and comparison of orbits. Comets, then, die, as Kepler wrote long ago, sicut bombyces filo fundendo.
Three North American silk-producing bombyces, very closely allied, have been mentioned in my previous reports; they are; Samia ceanothi, from California; Samia gloveri, from Utah and Arizona; and Samia cecropia, commonly found in most of the Northern States the latter is the best and largest silk producer.
The above-mentioned American species, like most other silk-producing bombyces, were bred in the open air; but besides these, I reared three other species of American bombyces in the house, under glass, and with the greatest success.
Larvae of all the silk-producing bombyces were preserved in their different stages, and can be seen in the Bethnal-green Museum.
It is, therefore, with the greatest pleasure that, for want of sufficient evidence, I withdraw this serious charge of cannibalism which I first intended to bring against them. From what has been said respecting the rearing of exotic silk-producing bombyces, especially tropical species, it must have been observed that several difficulties, standing in the way of success, have to be overcome.
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