Rare Spiral Torsiojis. 



539 



wliether the race we are dealing with is a half or an inter- 

 mediate race. Nevertheless the rarity of the anomaly 

 in repeated sowings strongly indicates the former alter- 

 native. This was certainly the case in Liipiiius Intciis, 



Fig. 127. Casiiarina quadrivalvis. A branch with a hitcral 

 torsion, a. From the botanical garden in Anisterdani, 

 1897. 



Silcne nodi flora and other species which occasionally 

 produced spiral torsions in my cultures. In J^alcriana 

 officinalis (Fig. 122, p. 528), which has already been 

 mentioned, the proportion of anomabms individuals raised 



