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99.994% pure aluminum single crystals were deformed in tension at 4.2°K, 78°K, and 295°K. The deformation at 4.2°K produced fine slip, observed by electron microscopy, and gave rise to a linear stress strain curve. At 78°K at low strain one again observed fine slip and a linear stress strain curve; at large strains (resolved shear strain above about 0.25) a weak slip band structure developed progressively and the slope of the stress strain curve decreased. The stress strain curves were orientation dependent at all temperatures.