“…In each of the cases reported above, the diverticulum exhibited the characteristics of the primary type. As a result of both post-mortem (Baldwin, 1911 ;Linsmayer, 1914 ;Nagel, 1925 ;Horton and Mueller, 1932 ;Grant, 1935) Edwards, 1939) investigations, primary diverticula of the duodenum are now recognized as being of relatively common occurrence. Experience has shown that despite this frequency they are, nevertheless, seldom associated with pathological affections, either of their own structure or of neighbouring organs.…”