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Ah, but this means they might have existed, just not found/classified yet.
Plus, really importantly, the book was written in 1892 not 1982.
There's been one hell of a lot of scientific and medical advances since then.
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might
yes, my mistake
yes
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Great, didn't want people running to the hills in fear...
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probably inaccurate
Found this book from 1982, lists a couple hundred diseases
Today they say there are about 10000 known diseases
https://archive.org/details/principlespracti00osle_4/mode/2up