Some ecological observations on Patella vulgata L. are recorded. 1. Homing is a very normal behaviour, older animals being more attached to a specific “home” than younger ones. 2. Orientation on the way back is still obscure. It looks as if no chemical, visual or tactile stimuli are involved. 3. There is a correlation between the position of the limpets on their homes and the angle of inclination of the rock surface. On vertical rocks the limpets sit head down. 4. Some remarks on temperature measurements in the animal during the dry period are added. 5. There is some evidence that the animals most exposed to the dry period in the tidal rhythm have the most conical shells.