156 



AEISTOTLE'S ANHOMCEOMEEIA 



zigzag arrangement of the gall-bladder of the pelamid, and 

 the exceptionally large size of the gall-bladder of the star 

 gazer. To what extent he was correct in defining the 

 positions of the gall-bladder in the snake and some of the 

 birds and fishes, referred to above, will be seen from the 

 table below. 



The spleen, Aristotle says, is on the left side of the body 

 and, in Man, is long and narrow, like that of the pig or 

 dog,* in the elephant it is rather less than fom- times larger 

 than that of the ox,t in ruminants it is of somewhat rounded 

 form, and in the horse, mule, and ass it is broad in one part 

 and narrow in another.! 



The human spleen is somewhat tetrahedral in form and 

 is not like the elongated spleen of the pig. The spleen varies 

 much in weight, even in mammals of the same species, but 

 Aristotle's estimate of the size of the spleen in the elephant 

 is too high. The average weight of the spleen in English 



* if. ^. i. c. 14, ss. 5 and 6 ; P. A. iii. c. 12, 674a. 



\ H. A. ii. c. 12, s. 8. | P. A. iii. c. 12, 674ff. 



