1\0. 628] VON GARTNER AND PLANT HYBRIDIZATION 437 



ence of the capacity for hybrid fertilization (p. 142). 



In the following discussion, more or less in the same 

 manner, Gartner shows an intellectual freedom from the 

 fetish of morphological species, and clearly demonstrates 

 the possession of a physiological temper and attitude of 

 mind. 



era, have shown that we have to consider two different kinds of rela- 



upon conformity in habit, i. e., in growth, in the shape and form of the 

 leaves, and in the harmony of the flowers and the organs of pollination : 

 these, however, in their greater or lesser inclination to sexual combina- 

 tion of species in hybrid fertilization. The former might be identified 



Now, since both are not infrequently met with in combination, for that 

 reason, our predecessors have not clearly distinguished both kinds of 

 relationship from one another, but have held both as identical, or rather, 

 have regarded the inner relationship as an immediate consequence of the 

 external, and assumed this as a law, so that the agreement of species in 

 habit, not only favored, not merely the existence, but also the strength 



From iho norcoinont' of tlu- vx\ovnix\ Umn and habit of^species of 



In the following passage, the morphological and the 

 physiological points of view are well contrasted: 



(fiii-tiicr, IK) iiKH'c th.-iii nuy other investigator in the 

 field oL' liyl)ri(lizali()n of his day, with the possible excep- 



