180  The  Genus  Eucalyptus.  {AmAp0riir,'imrm 
ishing  and  aromadendral  is  making  its  appearance,  thus  approach- 
ing the  typical  "  Boxes,"  phellandrene  being  absent :  Eucalyptus 
Cambagei,  E,  polybractea,  E.  dumosa,  E.  oleosa,  E.  cneorifelia  and  E. 
stricta. 
Group  III,  Class  C. — Eucalypts  which  yield  an  oil  containing 
Over  40  PER  CENT.  Of  EUCALYPTOL,  but  in  Which   PHELLANDRENE  is 
making  its  appearance,  thus  approaching  the  phellandrene  oils: 
Eucalyptus  melliodora  and  E.  ovalifolia  var.  lance olata. 
Group  IV. — Eucalypts  which  yield  an  oil  consisting  largely  of 
eucalyptol,  pinene  and  aromadendral,  but  in  which  the  eucalyptol 
does  not  exceed  30  per  cent.,  and  in  which  phellandrene  is  absent : 
Eucalyptus  tereticornis,  E.  punctata  var.  didyma,  E.  gracilis,  E.  viri- 
dis,  E.  Woolsiana,  E.  albens  and  E.  hemiphloia. 
Group  V. — Eucalypts  which  yield  an  oil  consisting  of  pinene, 
eucalyptol  and  phellandrene,  but  in  which  eucalyptol  does  not 
exceed  30  per  cent. :  Eucalyptus  viminalis,  E.  rostrata,  E.  ovalifolia, 
E.  Dawsoni,  E.  angophoroides,  E.  fastigata,  E.  macrorhyncha,  E. 
capiteU  ita,  E.  nigra,  E.  pilularis,  E.  Plane honiana,  E.  acmenoides,  E. 
fraxinoides,  E.  Fletcheri,  E.  microtheca,  E.  hcemastoma,  E.  sideroxylon 
var.  pallens,  E.  creba,  E.  siderophloia  and  E.  melanophloia. 
Group  VI,  Class  A. — Eucalypts  which  yield  an  oil  consisting 
largely  of  phellandrene,  eucalyptol  and  the  peppermint  ketone, 
but  in  which  the  eucalyptol  does  not  exceed  30  per  cent. :  Eucalyp- 
tus piperita,  E.  amygdalina,  E.  vitrea  and  E.  Luehmanniana. 
Group  VI,  Class  B. — Eucalypts  which  yield  an  oil  consisting 
largely  of  phellandrene  and  the  peppermint  ketone,  and  in  which 
EUCALYPTOL  IS  ALMOST,   IF   NOT   QUITE,  ABSENT  '.   Eucalyptus  CoHacea, 
E.  Stebeiiana,  E.  oreades,  E.  dives,  E.  radiata,  E.  Delegatensis,  and 
E.  obhqua. 
Group  VII. — Eucalypts  which  yield  an  oil  not  readily  placed  in 
the  other  groups :  Eucalyptus  stellulata,  E.  Macarthuri,  E.  aggregata, 
E.  virgata,  E.  patenting  vis,  E.  apicidata  and  E.  citriodora. 
Eucalyptus  obtusiflora  yielded  no  oil  upon  distillation. 
After  many  attempts  Baker  and  Smith  were  unable  to  obtain 
material  for  oil-distillation  of  the  following  species :  Eucalyptus 
acaciceformis,  E.  alpina,  E.  Baileyana,  E.  incrassata,  E.  ochrophloiay 
E.  odorata,  E.  regnans,  E.  uncinata  and  E.  Perriniana. 
The  authors  have  shown  in  a  diagram  the  probable  evolution  of 
the  eucalypts  as  indicated  by  their  studies  on  the  botanical  and 
chemical  characters  of  the  genus. 
