PLATE 1 



Fig. 1. Two plants of T. sessile var. giganieum with the soil exposed to 

 show their depth of insertion, the nature of the rootstock, amount of root 

 system and general vigor. The flowers are just on the point of opening. 



Fig. 2. Plants from four difl'erent rootstocks of T. sessile var. gigantcum 

 to show the effect of reduced and unilateral illumination on height and petiole 

 formation. The two plants in the center were at the front of a shed while 

 the other two plants were three feet back from the open front. 



[18] 



