FIELDS AND GRADIENTS IN NORMAL ONTOGENY 341 



1) u. 

 to W 







fcJD O 



^ X 

 rt 

 ^ ^ 



^, ^ 06 



-il :. 

 -5 s > 



:s «^ 

 ■£■£■5 



C O ^^ 

 « - t- 



<+- 5 "^ 

 o .2 J2 

 > . - K 



? 75 N 



<U O a 



■> ^h 



"rt "rt "^ 

 V- O C 



-M •r-i C3 

 C t! > 

 <U (U ^ 



^.£^ 



X a^ 



cs; « S 



si (U 1— ' 



U?^ C 



■^ u C 

 OJ IS o 



£ ££ 

 .2 ^-^ 



C ^ =^ 



£-£-g 

 S c ? 



O rt D 



W -^ C =+-! 



