“…The rest of the chemical reagents were all of the A. R. grade. The various degradation products were quantitatively assayed by the paper-chromatographic zone-strip technique described by Shimi and co-workers (Shimi, Nour El Dein & Imam, 1961;Shimi, Imam & Dewedar, 1961;Shimi & Imam, 1965). We used 0-5cm.-wide strips of Whatman no.…”