I want to know the answer to the following question:
What work was the first to see McKerrow use his new method?
All the background I'm provided with is that "By 1939, in his Prolegomena for the Oxford Shakespeare, McKerrow had changed his mind about this approach, as he feared that a later edition – even if it contained authorial corrections – would "deviate more widely than the earliest print from the author's original manuscript."". Is that enough to answer the question?