Plate 5O. 



if . Innnl Puh//H . //// 3.}}>h-o.r J.nrutJn . 

 //// vfn S,x>J ti.-tft. ////. V. ~-l particle f>r rfic tiustuffi 



tit/. .5. Thf Triaik ot'aJkf . 



th- frt' ( y 



