:>n; i\ cdM^KiiKNcr; intkunaïkiwi.k dk iikm-tum i;. 



THE FIXITY OF RACES OF WHEAT 



sr.MMAliY 



Tlic aullior <lra\vs alleiition lo llic ol'lcn repealcd assertion Uial cliiiuilir 

 conditions inay posscss a modifying inllncnce on varieties of \vlical. 



Ile ilocs nol agrée willi lliis opinion, but considers llial llie inllncnce ol' 

 cliniMlic conditions is limitcd to llic suppression of unadapted forms. An inle- 

 rcsling op]iorlnnity for tesling thèse llieorics occurred, on liiiding in (lie Labora- 

 lory otM. Louis de Vilmorin a collection ot cars of the ciill i\,ilc(| varieties of 

 wlienl grown at that period (IsriT-lsrjT)). 



(hi coniparing thèse cars wilii lliose harveslcd IVoni liie sanic xarielies in 

 1!MJ8-I!M0, it was fonnd Ihal lliey wcre idenlii'al in ail respiN'ts, alliiough sepa- 

 raled by an inlerval of tifly ycars during w liii-li nnnnal scleclinn liad lii'cn con- 

 tinu éd. 



'i'Iiis lixity is showu nol only in Uie characters ol' Ihe car. bul also in ail Ihe 

 ollicr chai'acters of llic plan!, excn Ihal of precorily. wliicli would appear lo be 

 niost dépendant on clinialc 



