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His work began fumblingly. There were days when, for all the joy of it, he dreaded lest Tubbs stride in and bellow, "What are you doing here? You're the wrong Arrowsmith! Get out!"
He had isolated twenty strains of staphylococcus germs and he was testing them to discover which of them was most active in producing a hemolytic, a blood-disintegrating toxin, so that he might produce an antitoxin.