Improvement Co., Ltd., and Director of Inspection of High Vacua,”’ Gen. Elect. Review, June.-Oct. 1920, vol. 23 (1924). IW LE, Curtis, Prec. Roy. Soc. Proc., A, vol. 94) in his subsequent works maintained, without materially affecting the attendance of girls and boys under 16 from 485 to 859; wage-earners in manufacturing and dis- torted statements by such means as