Abstract
When Trichomonas vaginalis in culture medium was exposed in three successive experiments to temperatures fluctuating between +7·2 and +13·0°C., between +10·5 and +15·5° C. and between +5·9 and +7·0° C., two strains survived for 3 days but no longer. One other strain used in these experiments lived for 1 day only, and two other strains did not survive for a single day.