“…(Received 3 AuguBt 1960) When mice, rats or rabbits are subjected to certain procedures which produce stress or injury, there is a fall in the concentration of non-proteinsulphydryl-group compounds of the liver and other tissues (Stolfi, 1936;Beck & Linkenheimer, 1952;Lindan & Work, 1953;Bartlett & Register, 1953;Beck & Rieck, 1958). The literature suggests that such decrease may be due mainly to decreased synthesis of glutathione, the most abundant component of liver non-protein-sulphydryl-group compounds.…”