10 



ZONES AND REGIONS [Pt. Ill, Sect. IV 



Cutting grown in Cadeac (Lowlands). 



Mean length of the peduncle of the 



umbel, 0-130 m. 

 Peduncle almost without hairs. 

 Mean length of the petiole, 0-080 m. 

 Mean width of the leaflet, 0-015 m. 

 Leaves seen by transmitted light, bright 



green (14 // of the chromometer). 

 Leaves thin. 



Flowers white. 



Cutting grown on the Arbizon Chain 

 (Mountains). 

 Mean length of the peduncle of the 



umbel, 0-180 m. 

 Peduncle villous. 



Mean length of the petiole, 0-020 m. 

 Mean width of the leaflet, o-oio m. 

 Leaves seen by transmitted light, dark 



green (14 e of the chromometer). 

 Leaves thick (one-fifth thicker than at 



Cadeac). 

 Flowers rose-coloured. 



FlG. 412. Alpine flora of Europe. Perennial rosette-plant. Dianthus glacialis. 



Kerner's experiments l were performed by sowing in his alpine garden, near 

 the Kuppe des Blasers, in the Tyrol (3,195 m.), plants that naturally lived 

 in the lowlands, and led to results essentially the same as those of Bonnier. 

 But Kerner in many cases observed a diminution in the size of the flowers 

 (for instance in Parnassia palustris), and the number of the flowers in the 

 alpine specimens was less than in those in the lowlands. In spite of this, the 

 conclusion to be drawn is the same as from Bonnier's experiments, namely 



1 Kerner, II, p. 507. 



