372 l\' CdNKrjlliMCK INÏKIl.NAÏlUNAI.K liK (.K.NKTinI K. 



The pcas adhère log;ellicr more or less comph'Icly nceording to Ihe conditions 

 in which vegelalive j^rowth lakes place. In llic cxpcrimenls under considéra- 

 tion it lias Ijeen possible to make clear enoug^h observations on tliis characler. 



In Ihe first experiment, the Mummy pea, with glaucous foliage, and salmon 

 flowers was crossed with the " chenille " pea, with cmerald foliacé and while 

 llowers. The F, plants were ail glaucous, with pnri>le llowers and l'ree seeds. 

 In Fj, the dillcrent flower colours and types oi' foliagi; occured in Ihe calcu- 

 lated nunibers, but the chenille character was only l'ound on the emerald plants, 

 the glaucous plants having free seeds. Moreover among the emcralds, Ihe 

 majority of the plants with adhcring seeds were piijmcnted, the majorily of the 

 wliite plants having free seeds. Study of the third génération supplies lurther 

 évidence that there is some connection bctween the faclors l'or type of foliage, 

 pigment, and the " chenille "' character. 



In another experinicnl , the variety " Emereva '' was crossed willi Ihe 

 " chenille " pea. Both parents hâve emerald foliage, but the two F, plants 

 were glaucous, thus siiowing that the union of two faclors is necessary to pro- 

 duce Ihe glaucous type. Both the Fj plants gave glaucous and emerald in Ihe 

 ratio 9 : 7, but the progeny of one plant ail had free seeds, and among the pro- 

 geny of the othcr plant, only two had some seeds adhering to eacli olher. 



Thèse results, of which Ihis is only a brief account, are diflicull to intcr- 

 pret. Il seenis évident that the " chenille " character is much influenced by 

 conditions, and a plausible explanation given by D' Ilagedoorn rests on Ihe 

 assumption that certain combinations of the foliage faclors with the faclor for 

 tiie " chenille " character, inerease the susceplibilily of this character to the 

 induence of climatic conditions. A similar influence musl bc altribuled to Ihe 

 faclors for pigment, as shown h\ Ihe lirsl experiment described. 



