…his 1d bazaar at 42 George’s street, south, the latter at his 6 1/2d shop and world’s fancy fair and waxwork exhibition at 30 Henry street, admission 2d, children 1d: and the infinite possibilities hitherto unexploited of the modern art of advertisement if condensed in triliteral monoideal symbols, vertically of maximum visibility (divined), horizontally of maximum legibility (deciphered) and of magnetising efficacy to arrest involuntary attention, to interest, to convince, to decide.
There are no more uses of "efficacy" in the book.
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The doctor weighed the efficacy of each treatment against potential side-effects.
They held hearings to investigate concerns about the safety and efficacy of the vaccine.