HISTOGENESIS OF RET IN. 



the 



and more upon 



margins, as seen in Vvr, 4. 



The rate of developnuMit of this lay(-r 

 the time of its first ;ij)j)(>:ir;iii((- to the ( 



will he reuHMnl.rivd, it is .luriiii:- ilii^ liiiir 



clei which Lowe (7<S) and Fal( hi i 's7 i foi 

 account for. From the he<rinnin(r of the staui 



the 



