“…There are numerous publications reporting the disappointing result with x rays (Wilson, 1939;Smiley and Clements, 1940;Smith and Werthessen, 1941 ;de Alvarez, 1942;Kullander, 1948;Dilworth et al, 1950;Mohler and McConnell, 1952;Peel et al, 1955;Beecham et al, 1955).…”