摘要：Variations of components took place in the hot spring at seaside of Obama (Nagasaki Pref.) over a long period of time were investigated. Owing to disordered boring of spring source and waste of spring water for ten years from 1946, the spring temperature was declined and the chemical components were concentrated threefold as compared with those of the 1930's by mixing with a large quantity of sea water. After decrease of spring sources to 28 from 84 in 1960, the concentration of chemical components and the temperature were recovered. The rate of sea water mixed in spring water is constantly 33% from 1962 to 1964, but not recovered to a level of 20% of the 1930's yet.
