166 THE STRUCTURE OF MAN 
lower part of the small intestine." This diverticulum is connected 
during the embryonic period, and sometimes still longer, with the 
navel, by a cord, containing the last vestiges of the ductus 
omphalo-mesentericus, which connected the yolk-sac with the 
intestine. We have in this 
a mere vestige of a foetal 
organ. 
[On examination of 
769 bodies, at the insti- 
gation of the Collective 
Investigation Committee of 
the Anatomical Society of 
Great Britain and Ireland,” 
the diverticulum ilei has 
x“ ; been encountered in but 
sixteen cases, or in little 
Fic. 98.—HuMANn tee a more than 2 per cent. 
@., cesophagus ; py., pylorus ; c’.c’., constrictions : : 
of the pyloric chamber. Special interest attaches to 
Rolleston’s report upon 
the examination of 337 individuals (nearly 44 per cent of 
the whole number) which were equally representative of the 
two sexes, as nine of the ten possessed of the diverticulum 
were males. | 
[A remarkable case has more recently been put on record by 
Buchanan,* of an adult male subject in whom this appendage had 
a total length of 9 cm. and a basal circumference of 11 cm., 
and contained a spacious central cavity having a wide aperture of 
communication with the ileum. The remaining alimentary 
viscera were strikingly aberrant, the colic head and the ccecum 
being directed towards the left hypogastric region (instead of the 
right), the ccecum terminating in an appendix vermiformis which 
measured 134 cm. in length.] 
1 According to Sappey, the length of the intestine in white men of middle height 
is 9600 mm.,—8000 of which are to be reckoned to the small intestine, and 1600 to 
the large one. According to the researches of Chudzinski, who examined nine 
Negroes, the total average length was 8667 mm., 7.e. almost 1000 less. There were, 
however, great variations in length in different individuals. If the length of the 
intestine is affected by the height of the individual, it can hardly be so to any great 
extent. 
The fact that the total length of the intestine is less in Negroes is due to the 
comparative shortness of the small intestine, for the large intestine is longer in the 
black than in the white races. 
* [Jour. Anat. and Phys., vol. xxvi. p. 91.] 
® (Ibid. vol. xxvii. p. 559.] 
