943and craniotabts were present (Fig. 1). The liver was hard and palpable 2 cm below the costal margin. The spleen could not be felt. Over the two years of observation scratching and unexplained fever up to 38-39 'C were continuously noticed (Fig. 2). Subcutaneous haemorrhages with hypoprothrombinaemia occurred at the age of 5 and 25 months respectively. Up to the age of 1 year total serum bilirubin remained below 1 mg % (Fig. 3). The stools were intermittently gray or white and the urine contained urobilinogen and on some occasions bilirubin. Thin layer chromatography of ethyl anthranilate azopigment extracts of the duodenal fluid showed presence of the fl-compound and increase of the 'y-fraction which is suggestive for cholestasis: oto 13.1, oci P0, 0x2 09, 0t 333, ,B 6 1, y 27.9 and 8 47*7 % (Fevery et al., 1972). At the end of the first year, transaminases were moderately raised. Serum nucleotidase remained as low as 1*7-13 IU/l. At the age of 71 months, bile salts in the serum and duodenal content were 82 ,ug (normal value 1 gg) and 150 ,ug (normal value 3-5 mg) per ml respectively. On two more occasions, no bile salts were detectable in yellow stained duodenal fluid samples. The daily urinary excretion of bile salts was 24.7 mg of which chenodeoxycholic acid and cholic acid made up 12-6 % and 87-4 % respectively. No lithocholic acid could be detected. After the age of 1 year serum bile acids were studied only once and were 107 ,ug/ml. The percentage of sulfobromo-