Included is a summary of the material presented at the Sheath meeting at Chalk River on Sept. 25--26, 1956. Information is included on cladding plates, end plugs for plates, electroplating techniques, equipment to extrusion clad full length plates at SRL, progress on extrusion cladding the inside of tubes, and a program for future work on extrusion cladding.

The purpose of this report is to present observations, developed jointly with Purex Technology Operation, which support the ``foam`` theory for high dissolver tower differential pressure, and to recommend the installation of test jets in a dissolver jumper which should destroy dissolver foam and thereby improve overall dissolver performance.

An investigation of the interactions between 300-Mev neutrons and xenon was made by means of a cloud chamber in a pulsed magnetic field of 21,700 gauss placed in the neutron beam of the 184-inch Berkeley cyclotron. Eighty-seven negative pion events and 257 other stars were analyzed. In addition an experimental check was made on the energy of the incoming neutrons. Classification, identification, and angular and energy distributions of prongs associated with all events are presented. Interpretations of results are given.