'20 



THEORY OF EVOLUTION 



patihle with tlie theory of evohitioii. Let nie 

 iUu.strate tliis liy an exajiiple. 



Tlie eniliryos of tlie chick (tig. 8) and of 

 man {tig. 9) ])o,sses.s at an early stage in their 

 (leveloi)nient gill-sh'ts on tlie sides of the neck 

 like tliose of fishes. Xo one familiar with the 



Fic. II). Yoiin^' lisli, <l()rs:il view, /mil hide \'icw, shiiwii' 

 ill slils. (After Ki.]iheli.) 



1-elations of the parts will for a moment doiiht 

 that the gill slits of these embryos and of the 

 hsh i-e])resent the same strnctm'es. When M'e 

 look further into tlie matter we find tJuit yomig 

 lish also possess gill slits (fig. 10 and 11 ) — even 

 in young stages in their development. Is it not 



