“…The tube which entered the absorption tower had a bulb at the lower end with small holes around the circumference which served to spray the water in small streams over the towers, washing their walls as it flowed down the sides. A similar method of washing the towers is described in more detail by CHILDERS, et al (4). The rate of apparent photosynthesis was found to fluctuate through a daily cycle with the maximum rate occurring during the early morning hours and the minimum rate occurring during the mid-afternoon hours.…”