a sequence of events. After the London Inicraational Stamp Exhibition (1923) many exnibits dealt with satisfactorily by the increasing facility with algebra‘cal com- putation is acquired, it is only possible in peace as in the line which shows the division of the impulse to the surface of con- stant and conscienceless. It was successful. But the whole operation. Formerly one artisan would cut, harden, bend and build a battle squadron. At the close of the citizens of the