Congenital obliteration of the bile-ducts, though long recognized and reported with relative frequency in medical literature, is still, we believe, a sufficiently rare condition to warrant an additional clinical and pathological report. The history and pathological findings of a case will first be given, and subsequently the incidence, symptomatology, gross and microscopical anatomy and pathogenesis will be discussed. I. REPORT OF CASE Patient. —J. M., age 6 weeks, male, Hebrew, was admitted on March 24, 1910, to the children's clinic and subsequently to the service of Dr. Finley of the Montreal General Hospital. The complaint was "yellowness of the skin." The following history was obtained from the mother. Family History. —The father was living and well at 42 years; the mother was living and well at 35. When 18 years of age, during her first year