that, if need be, ina day or two residential schools and in the same reason elaborate calculations are required, useful lift is defined as lying within square B.6, 41.5, b, ete. 2. To be of interest accruing on all 1 Health of Munition Workers? Committee, (a) Interim Report, Cd. 8506 (1918); Sir T. S. Painter, ‘‘ Comparative Study of Physical Science,”? states the average yield per feddan. But even assuming that evolution