抄録
On the resistance of Oncomelania nosophora to dryness, several reports are available (Cort, 1919; Yamanouchi, 1919; Bartch, 1929; Sugiura, 1933; Kawamoto, 1954) . They all observed only their survival under the dried condition. Oncomelania nosophora, a Japanese vector snail of Schistosoma japonicum, however, has an amphibious character and can survive for a certain period under dried conditions. The effect of dryness on snails is considered to result in more evaporation of water from the snail body and inflict the gradual loss of water which would be the cause of their death. The purpose of this work is to know the relation between the rate of the water loss from snail body and the survival rate of the snail when put under a continuous dried condition.
