AmAJp0r^r;l?oh4a^m•}  The  Genus  Eucalyptus.  -181 
The  monograph  is  an  interesting  one,  with  numerous  excellent 
illustrations,  and  contains  very  many  new  facts  in  addition  to  an 
entirely  new  presentation  of  the  subject.  Not  the  least  interesting 
is  the  fact  that  many  (nearly  thirty)  species  of  Eucalyptus  yield  an 
oil  resembling  that  obtained  from  E.  globulus,  containing  over  40 
per  cent,  of  eucalyptol,  and  that  the  oil  of  eucalyptus,  e.  g.,  E. 
globulus,  is  the  same  in  character  and  constituents,  no  matter  where 
the  trees  are  grown.  It  has  been  heretofore  supposed  that  the  oils 
of  E.  globulus,  E.  cneorifolia  and  a  few  others,  which  have  been 
derived  from  trees  growing  in  the  southern  States  (as  Tasmania  or 
South  Australia)  were  superior  to  those  obtained  from  trees  growing 
elsewhere,  as  ■  in  New  South  Wales,  whereas  this  preference  is  in 
reality  due  "  to  the  perseverance  and  persistency  of  the  companies 
working  these  species,  and  especially  to  the  pioneers  in  the  industry 
having  established  themselves  in  the  neighboring  States."  The 
statement  is  made  that  "  the  demand  for  oils  rich  in  eucalyptol  can 
now  be  met  by  the  distillation  of  species  growing  in  New  South 
Wales  and  from  which  the  present  requirements  of  the  work  ^could 
be  supplied." 
It  is  furthermore  of  interest,  that,  according  to  McClatchie,  no  less 
than  eight  species  of  the  eucalypts,  yielding  an  oil  containing  over 
40  per  cent,  of  eucalyptol,  are  being  cultivated  in  the  United  States. 
Over  forty  species  of  Eucalyptus1  have  been  grown  successfully 
in  the  United  States.  The  following  species  are  adapted  to  hot, 
humid  regions  and  will  produce  useful  timber :  Eucalyptus  botryoides, 
E.  citriodora  and  E.  resinfera. 
The  following  are  best  adapted  to  warm,  moderately  humid  regions 
having  light  winter  frosts,  and  are  most  suitable  for  producing  timber 
valuable  for  commercial  purposes :  Eucalyptus  botryoides,  E.  diver  si- 
color,  E.  globulus,  E.  gomphocepliala  and  E.  tereticornis. 
The  following  are  adapted  to  situations  not  excessively  warm 
during  summer,  but  frosty  during  winter,  and  are  most  likely  to 
give  good  results  in  the  Southwest :  Eucalyptus  gunnii,  E.  leucoxylon, 
E.  polyanthema,  E.  rudis  and  E.  tereticornis. 
The  following  are  adapted  to  dry  regions  free  from  heavy  frosts, 
and  produce  valuable  timber:  Eucalyptus  corynocalyx,  E.  creba,  E. 
diversicolor,  E.  globulus,  E.  leucoxylon,  E.  polyanthema,  E.  sideroxylon 
and  E.  tereticornis. 
1  McClatchie,  loc.  cit.,  p.  85. 
