Classical data on the chemical cure of high- or low-temperature growth lesions. Day/night temperatures are in °C. +, Vitamin(s) added; –, no vitamin; differences significant at *P < 0.05 and **P < 0.01. The data are for species of the ornamental plant Cosmos (Bonner, 1943), for Arabidopsis (Langridge and Griffing, 1959), and for other species (Ketellapper, 1963).