STARCHES OF ZINGIBERACE^. 



795 



in which respect they bear close resemblances to H. gardnerianum. In comparing the composite 

 reaction-curves, it will be seen that each genus has a type different from the others, and that the 

 curve of Curcuma is nearer related to that of Zingiber tlian Hedychium. It is of especial interest 

 to note that the temperatures of gelatinization of Z. officinale and the two Hedychium starches are 

 very close, that the temperatures of Curcuma are about 10 higher; and that the temperatures of 

 gelatinization of the varieties of Zingiber are from 10 to 15 higher. The Jamaica and Cochin 

 ginger starches, judging from their histological and reaction differences, as compared with the offici- 

 nal ginger, were doubtless obtained from mongrel plants. 



p I Gv r p 

 VH vo 



Qart No. 332. 



GV S T CI CA PA FC P S CI PA CA 

 PC PS 



5 1 



15 

 20 



60 12 



65 13 



WINUTES 

 Curve of Reaction-Intensities of StarcK of Zingiber. 



30 

 35 



15 



50 



P I GV T P 

 S 



Chart No. 333. 



I GV S T 



CI CA PA FC P S CI PA CA 

 ~ FCPS 



6 

 10 



20 

 25 



60 

 65 



Chart No. 334., 



I GV S T CI CA PA FC PS CI PA CA 



15 



20 



40 



45 



Composite Curve of Mean Reactlon-Intenaities of Starch 

 of Hedychium. 



Composite Curve of Mean Reacticn-Intensities of Starch 

 of Curcuma. 



