Mr. Valling, a Canadian trapper is helping, but a campaign is being prepared that will embrace poison, gas, guns and searchlights. War has been declared on the musk rat and the Government hopes to borrow the services of the Bavarian expert Herr Roithe, whose uncanny ability to trace the pest has brought him world wide fame. A quarter of a million rats are said to be burrowing in the banks or the Severn and ots tributaries and many other parts of the country has been invaded. January 23, 1933. ;M