Abstract
The degree of the frost hardiness of Indian, Indian hybrid, and Chinese varieties was compared each other in the refrigerator, and several factors relate to it were also studied. The frost hardiness of Indian hybrid varieties was about intermediate in them. The dehardening in spring was accompanied with the decrease of the sugar content in tea leaves, but the water content in them did not decreased at that time. The size of the tissue cells in tea leaves seemed also to have some relation to the frost hardiness. The relation between the frost hardiness and the rate of respiration or photosynthesis of tea leaves was also examined, and no evident relation was observed.
