90 



LIFE IN NATURE. 



in many rapidly 

 Fig. 17. 



Diagram of the chicken 

 in an early stage 

 (after Wagner). TLC 

 doable lines repre- 

 sent tne dorsal plates 

 before described. 



a anterior lobe ot brain. 



b middle lobe. 



c posterior lobe. 



d rudiments of the 

 back-bone. 



growing plants, if a leaf be wounded 

 a bud springs from the spot. The 

 wound constitutes an artificial 

 " axil." So, again, in " bud- 

 ding," a wound is made to enable 

 the new root to grow. 



One reason, then, why buds come 

 in axils surely is, that there the 

 least resistance is offered to the 

 expansion of the soft substance of 

 the plant. If we turn, again, to 

 the development of the bird, we 

 shall find what is precisely analo- 

 gous.* Very many of the organs 

 are formed, like buds, in axils. 

 Fig. 17 represents the young 

 chicken at an early period of its 

 formation ; the brain consisting 

 then of three small lobes. 



Now, in the interspaces or axils 

 between these lobes, the eye and 

 the ear bud out. These organs 



* It is the same in all vertebrate animals, but the bird is most 

 easily examined. 



