1. The effects of synthetic growth substances on the shoot apex of Tropaeolum majus L;Ball;Amer. Jour. Bot.,1944
2. Development in sterile culture of stem tips and subjacent regions of Tropaeolum majus L. and of Lupinus albus L;Ball;Ibid.,1946
3. Ball , E. 1948 Differentiation in the primary shoots of Lupinus albus L. and of Tropaeolum majus L. In Symposia of the Society for Experimental Biology. II. Growth in relation to differentiation and morphogenesis 246 262
4. The shoot apex and normal plant of Lupinus albus L., bases for experimental morphology;Ball;Amer. Jour. Bot.,1949
5. Differentiation in a callus culture of Sequoia sempervirens;Ball;Growth,1950