E.Zielinski discovered experimentally the following method that enables us to realize film boiling comparatively easily. That is, when a wire on which nucleate boiling is occured with heating current adjusted to a rather low heat flux is pulled out of water for a short time, the surface of the wire dries up and its temperature rises, even if heat flux is kept constant, since the wire is brought to contact with air. If the wire is sunk again in water afterward, it will be heated red-hot after a few seconds and film boiling appears. He asserts that film boiling is to be realized thus with comparative easiness by cutting off temporarily the contact between heating surface and water. The authors who were interested in the experimental process of this paper carried out similar experiment and succeeded in realizing a condition where nucleate and film boiling coexist stably on the same heating surface by heating with a given heat flux. This is considered to be a kind of transition boiling and the present paper deals with the boiling phenomena at the coexistence of nucleate and film regions in saturated water, subcooled water and sodium oleate solution as well as their relation with boiling characteristic curve.