This can be done by subtracting one-half the depth of focus from the stimulus to accommodation when the subject over-accommodated and by adding one-half the depth when he under-accommodated.

[A] Harlot form ſoft-ſliding by, / VVith mincing ſtep, ſmall voice, and languid eye; […]

The toxicant would need to be relabeled by the U.S. Environmental Protection Agency for use as a selective amphibicide in static culture ponds before it could become available for use as described here.

On a sudden a low breath / Of tender air made tremble in the hedge / The fragil bindweed-bells and briony rings; […]