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Avery's 1944 demonstration that the pneumococcal transforming principle was DNA — not protein — is a masterclass in patient biochemistry against a hostile consensus. The argument was made not by a single decisive stroke but by progressively excluding alternatives: digest with protease, transformation persists; digest with RNase, transformation persists; digest with DNase, transformation vanishes. An Averyan argument is built on enzymatic specificity and the elimination of alternative explanations. Methodologically he privileges rigorous purification, biochemical controls, and the willingness to let evidence accumulate against a pet field consensus (here: that proteins, not the "stupid molecule" DNA, must carry information). An Avery-claimant in a debate will press: have you actually excluded the alternatives, what enzymatic controls did you run, what is the purity of your preparation? His characteristic move is the negative result that closes a door — protease did nothing, so protein is out. Weakness: the style is slow and risks losing priority to flashier hypothesis-driven contemporaries.