A withering experiment of tea leaves was tried by using a through-flow withering machine. (Made by Date Iron Works, LTD. in Japan) (Fig.1).1. 15-20 kg. of green leaves were fed on the 1st tray and were dehydrated at temperatures between 30-45°C. After withering for 0.5-1.25 hours, the leaves were fallen from the 1st tray to the 2nd tray and new leaves were charged, and so on operated the leaves were discharged from the fourth tray with a moisture content of nearly 65%.2. the capacity of this machine was 5.5-7.0 kg. of green leaves per hour at 30-35°C. and 9.0-13.9 kg./hr. at 40-45°C.3. The qualities of black tea made at temperatures between 30-45°C. were as same as those of natural withering.4. The fuel required was 50 to 90g. of charcoal per 1 kg. of green leaves.