In a Venn diagram, an atom is depicted as an area circumscribed by lines but not cut by any line.

Oh, yes, do let's dance together—it's so nice to meet a man who isn't a scaredy-cat about catching my beri-beri.

The allotype need not be described by the protologist (first describer) ; it can be contained in the original as well as in any subsequent description by other authors.

those lifedraining slow cures and bedridden agues