... reached the interior cavities of its body, gives off the minute floating corpuscles which are the earliest stage of the Empusa. The disease is "contagious," because a healthy fly coming in contact with a diseased one, from which the spore-bearing filaments protrude, is pretty sure to carry off a spore or two. It is "infectious" because the spores become scattered about all sorts of matter in the neighbourhood ... — Discourses - Biological and Geological Essays • Thomas H. Huxley
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