Two growing-stock density experiments, one in 80-year red pine, the other in 40-year red pine, have been followed for 10 years. The third experiment, in 50-year red pine, has been followed for 5 years. Basal area growth is only slightly influenced by stand densities from 60 to 140 square feet of basal area per acre. Total height growth is not affected at all by this range of stand densities. Total cubic-foot volume and cordwood growth increase as density increases, with the increase most pronounced in the younger stands. Diameter growth of dominant and codominant trees is twice as much at 60 square feet of basal area as at 140 square feet.