.-„s-j l\- œ.M-KIlKNCK l_Mi:i!NAri(iN\I.K W. GKM-Tlljl K. 



soiiio slif4hl variations, arc rclalively pure hred in contrait witli Uic widc iliasni 



separalinif Ihe very différent spccies crossed lo obtain liie lixlnid. 



In IS'.IT I crossed Ihe comnion sweet orange (r///(/.s Aiirnnliiini. sincuais L.) 

 wilh Ihi' Oriental Irifoliale orange (C/Vrus trifoliata L.). n de<idii(.iis species very 

 distinct IVoni Ihe common citron» fruits'. 



In comparison with thc wich' chasm tiial séparâtes tiicse spccies. Ilie varia- 

 lions Ihey show inside their rcspeclive limits are insig-nificanl. In otlier words. 

 for pnrposes of genetic study, tlie germ cells may be considered pure in so far 

 as ncilhcr of the parent spccies show varinlions that lo any ]icrccplihlc dcgrec 





l'i;;. I. 

 tli< 



un ci Iran;; u% slio-.viiig tlie «[Wls iliic lo fiiiisims gi-owlli aiiiong tlio In 

 Tlio uil glands are very sinall. Reduced l,i. 



bridge the \vide gulf separating thcni. In lacl. tlic uldcr trees of Cllrus lii/n- 

 liulu growing in America are ail descended froni a very fcw [dants ini]iorlcd 

 from Japan some forty years ago and show few variations and thèse of niinor 

 exlenl^ 



The sweel orange wasgro'.Mi troni sced lor a couple of centuries in Fiorida 

 before Ihe European varielies werc iulroduccd by (lencral Sanford, thc Rev. 

 Lyman Phelps, and other progressive nien about half a century ago. It is true 

 thaï a nnmberof varieties of so-called Fiorida oranges were found among Ihcse 

 lens of thousands of seedlings, but tlicy are ail of the same gênerai type and 

 cannol for a moment be held lo obscure the profound différences separating, 

 them, and in facl ail known sorts of thc common orange, from Cilrus trifaliala. 

 Nevertheless, eleven of thèse sislerhybrids grown in 1897 from secds of a single 



I. The flower buds are formed carly in suniinerand open Ihe following sprin..; on old wood. as in 

 llie case id' nuniv olher deciduous Irces. Tlie siamens are free, Ihe pistil 7-8 cellcJ, Ihe pulp vesicics 

 iiave glan lular secreling hairson their surface, Ihe pilh lias transverse plaies of thick-walled cells.lhc 

 fruits are downy hairy, tlie pelais are claw.'d, Iho leavcs Irifiliale. the Howers are nearly scssilc. In 

 ail of thèse parliculars. C.trifoliatn dillers fr<ini any ntlior species o( Cilriix. 



i. The chief variation iis a leiidcncy lu sl.iMiinody uf Ihe priais, makin^r cr)-t.iin plants sniall- 

 llowered or even apelalous. 



