No. 609] THE THEORY OF THE GENE 543 



to be able to show a particular sta^^o in tlio cliairi of events 

 by vvhicli the character of certain featliors is influon<'ed. 

 I need not i)oint out that there is not tlio sli^uiitest reason 

 to identify the substance i)roduced in tlie ti-ti- with tlie 



sul)st;m(M' of tlie u'ene; the chemical composition of the 

 intern,! I MMTdinn may be entirely different from that of tlie 

 g-eiKMiir i;itt('r pr.Mlucino^its result inconjuii.-ticn witliMil)- 

 stance- re>ultini>- from other p^enes. There cvm x i ca-on 

 for sui)posing that the way in which the rlVrr;. nr.- pro- 

 duced here are the same as in all developn,.'iit wh.-n ;h(' 

 end result is the collective product of sul)staiu'«\s pro- 



