“…Observation of the changes described may be particularly useful in clarifying aetiology in the patient suffering from idiopathic steatorrhoea whose clinical state and steatorrhoea do not improve on a gluten-free diet. Such measurements may also be of value in elucidating the nature of jejunal mucosal changes in patients who have other disease (Townley, Cass, and Anderson, 1964;Johnstone and Adams, 1964;Creamer, 1964 andGjone, Myren, and Refsum, 1965;Lee, 1966;Fry and McMinn, 1966;Marks, Shuster, and Watson, 1966;Shuster, Watson, and Marks, 1968 The biopsies were taken in three treatment periods, I, II, and III, as well as in the pretreatment period, P, andin the gluten loading period, G. The changes in the mucosa were analysed for the intervals from P to each of I, II, III, and G; from I to II; and from III to G. None of the patients had a biopsy in every one of the five periods and some patients had more than one biopsy in a given period. These replicates were deleted so that, at most, one biopsy was recorded in each period, the dates being chosen so as to equalize the time intervals as much as possible.…”