1. Davies, R., Boyes, W. W.,etc.Cold storage of plums. Low Temp. Res. Lab., Cape Town, Ann. Rep. for 1933, p. 66 ; 1934/35, P. 78 ; 1935/36, p. 69 ; 1936/37. P. 38; 1937/38, P 13.
2. Davies, R., Boyes, W. W.,etc.. Prestorage treatment of plums with acetylene. Low Temp. Res. Lab., Cape Town, Ann. Rep. for 1938/39, pp. 25, 31.
3. Isaac, W. E.Evolution of a growth-inhibiting substance by ripening peaches and plums. Low Temp. Res. Lab., Cape Town, Ann. Rep. for 1936/37, p. 172 ; see also Ibid., 1937/38, p. 93; 1938/39. P. 77.
4. Putterill, V. A., andDreyer, D. J.The 1938/39 deciduous fruit season. Union of S. Africa, Dep. Agric., Pamphlet 211, 1940 (p. 48).
5. Smith, A. J. M.Precooling of fruits in South Africa. Union of S. Africa, Dep. Agric., Pretoria, 1937.