MENTAL HEALTH CONFERENCE

glucose, though the reaction mixture turns orange at one stage. Occasionally, this sequence of colour changes is not readily detected, so that urine actually containing more than 2% glucose appears to contain only 1%. However, such an occurrence is infrequent and the resulting error relatively unimportant. results of the semi-quantitative tests are expressed as the number of urines within each group giving a particular result with the test in question. Figures in the diagonal column (bold type) represent urines in which there was satisfactory agreement between true glucose values and the result of the semi-quantitative test. Figures falling outside the diagonal column represent urines in which the semi-quantitative test gave an error of more than 33%.