2 OO 



limited area of an ordinary culture. The case of the todeas 

 involves the actual evolution of a different species at one 

 jump, for had the varied type not appeared under culture 

 as described, the subsequently-imported plants would never 

 have been associated with T. superb a at all, a fact which 

 opens up the whole question as to wherein lies the difference 

 between a true species and an absolutely, constant distinct 

 variety which produces true progeny, in continuous 

 succession, as so many varieties do. 



Chas. T. Druery, F.L.S., V.M.H. 



