1. 1W. A. Weyl , "New Approach to Surface Chemistry and Heterogeneous Catalysis ," Bulletin No.57 , Mineral Industries Experiment Station, The Pennsylvania State College, State College, Pa., March1951 ; p.72 .72 pp.
2. 4See p. 71 of footnote 3.
3. 5D. P. Enright , "Absorption of Water by Cesium Disilicate Glass ," Technical Report No. 42, Office of Naval Research Contract N6 onr 269 Task Order 8, The Pennsylvania State College, State College, Pa., April1952 .