Am  Jour  P^arti 
Kov  ,  1F80. 
Cinchonas  of  U.  S.  Commerce. 
533 
Resin-cells  few  or  none  {/.      they  vary). 
Laticiferous  ducts  absent.  C.  fnicrantha:  Thickest  fibres  mm. 
•10  in  diameter.  Fibres  in  groups  of  2  or  3,  in  older  barks  of  more. 
Medullary  rays  thin  and  indistinct. 
Cinchona  corditoli 
Cinch  Jiia  purpu 
rea.    x  40. 
C.  pitayensis;  thickest  observed  fibres  average  mm.  -075.  Thin 
iibres,  mostly  in  single  lines;  section  in  places,  or  sometimes  entirely 
light  gray. 
Resin-cells  Present, 
Laticiferous  ducts  absent.  C,  kncifoUa:  Thickest  fibres  aver- 
age nim.  -0^4.  Numerous  resin-cells.  Fibres  in  liiu,  or  groups  of  2 
to  4,  with  some  staff-cells.     Medullary  rays  large-celled. 
