18 SOME ASPECTS OF THE INDIGO INDUSTRY IN BIHAR 
ences between the distribution of the roots of Roselle and of deep-rooted types 
of patwa are shown in Fig. 3, while in Fig. 4 the roots of an early and late type 
Fic. 4. Early (left) and late (right) types of root-systems in H. cannabinus. 
of patwa are illustrated. The surface-rooted Roselle crop and the early types 
of patwa do well at Pusa even when the soil is waterlogged. The deep-rooted 
types of patwa in such seasons, on the other hand, suffer severely from wilt. 
Similar results are obtained in the case of sann varieties. The local Bihar 
variety with surface roots sets seed but the deep-rooted tall variety from the 
