Individual weights and specific gravity values were determined on more than 1,400 tubers representing six varieties and 17 lots of potatoes. Four lots of the 17 gave statistically significant correlation coefficients for weight and specific gravity. Two of the coefficients were positive and two were negative. No explanation of the relation can be given on the basis of location, size of tubers, or average specific gravity of the lot. No practical significance as far as separating potatoes for specific gravity on the basis of weight can be given to any of the relations found.