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We examine quenched chiral logarithms in lattice QCD with overlap Dirac quarks. From our data ofm π2 , we determine the coefficient of quenched chiral logarithm δ = 0.203(14), 0.176(17), 0.193(17) and 0.200(13) for lattices of sizes 8 3 × 24, 10 3 × 24, 12 3 × 24 and 16 3 × 32 respectively. Also, for the first three lattice sizes, we measure the index susceptibility...