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quired  to  attain  maturity,  and  a rubber  yield  of  about  ten  per 
cent,  of  the  dried  plant  is  obtained.  In  plants  grown  under  the 
care  of  cultivation  the  yield  of  rubber  has  been  practically  neg- 
ligible. All  means  taken  to  hasten  maturity  appear  to  strike 
directly  at  the  commercial  value  of  the  plant,  i he  second  growth 
from  the  roots  is  also  not  so  valuable  as  the  first  and  takes  many 
years  to  be  of  any  use.  Indications  therefore  suggest  that  this 
new  industry  after  enjoying  a few  years  of  great  prosperity  will 
gradually  dwindle  and  finally  entirely  pass  away.  It  must  not  be 
overlooked,  however,  that  it  is  exceedingly  improbable  that  a 
profitable  enterprise  will  be  allowed  to  disappear  without  an  effort 
to  permanently  establish  it.  There  is  no  doubt  that  those  at 
present  engaged  in  the  production  of  guayule  rubber  will  exhaust 
every  scientific  resource  before  they  relinquish  their  hope  of  the 
future  of  the  industry.  In  the  face  of  our  present  knowledge 
of  agriculture  and  the  various  sciences  which  contribute  to  suc- 
cessful field  operations,  it  would  be  a bold  assertion  to  say  that 
guayule  rubber  is  to  disappear  from  the  market.  In  spite  of 
apparently  insuperable  obstacles  to  the  successful  cultivation  of 
this  plant,  it  is  probable  that  before  the  wild  source  is  exhausted 
many  of  the  difficulties  to  the  cultivation  of  guayule  will  have 
been  in  a measure  solved.  However,  the  growth  of  the  latex  pro- 
ducing tree  will  without  doubt  still  control  the  market,  and  when 
the  intractable  guayule  has  been  reduced  to  cultivation  it  may 
offer  a means  of  turning  to  use  some  of  the  arid  regions  of  these 
islands. 
HAWAIIAN  RUBBER. 
Mr.  E.  V.  Wilcox,  Director  of  the  Hawaii  Agricultural  Experi- 
ment Station,  has  received  the  following  report  upon  samples  of 
rubber  sent  to  Seigmund,  Robinow  & Sohn  of  Hamburg,  Ger- 
many. These  samples  were  the  product  of  the  experimental  tap- 
pings at  Nahiku.  The  valuation  placed  upon  the  better  grades 
is  equal  to  the  price  now  being  paid  for  the  best  plantation  Para 
from  Ceylon. 
A report  was  also  received  in  a late  mail  by  William  William- 
son, President  of  the  Hawaiian-American  Rubber  Co.,  from  Poel 
& Arnold,  rubber  importers  of  New  York,  upon  samples  of  grades 
No.  i and  No.  2 ; in  which  identical  valuations  were  placed  upon 
the  respective  grades. 
Dear  Sir:— We  are  in  receipt  of  your  favor  of  24th  May  and 
of  the  samples  of  rubber  you  have  been  good  enough  to  send  us. 
We  have  minutely  examined  these  samples  and  beg  to  give  you 
the  following  report : 
No.  1. — Fine,  pale,  yellow  biscuits,  which  would  bring  a better 
price,  if  coagulated  more  carefully,  in  any  case  the  dark  spots  in 
the  center  should  be  avoided.  Valuation,  $1,243/2. 
