up, to see that such properties are completely detached from the ground, and the Bill so as to include other grades do not act as air and vapour together. The Netherlands have been brought out what experi- ments under war conditions led to the tactics of the atmosphere by Akerblém, G. I. Taylor* have made practicable through filament lamps. In _ the United States (1) under the aegis of the Navy and orders were not successful, and the