In this transcription, italic text is denoted by _underscores_ and bold text by =equal signs=. Superscripts are indicated by ^ (e.g. Fig. 509, _I^a_). The text contains numerous inconsistencies of hyphenation. A few have been adjusted where there was clear evidence of a preferred style (e.g. meso-colic-->mesocolic and meso-duodenum-->mesoduodenum) but most have been left in their original format.…
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