Discussion on the foregoing four Papers.^*

Brigadier F. E. Fowle observed that Mr. Grigson and Dr. Lee had

made only cursory mention of some of the difficulties they had encountered

in the development of P.B.S. He paid tribute to the excellence of the

Author's work in overcoming those difficulties, but felt that the jute

manufacturers of Dundee might express different views. He himself had

been in charge of all the metal track surfacings made in the United Kingdom

during the war and the developlllent of theJ;J;l for the last 18 J;J;loni!hs.

The Sommerfeld Track was the first one which was produced that was

of any practical value, and it was comparatively easy to make. In the