GENUS STROMANTHE. 



839 



or a Calathea starch. In their reactions these genera, while exhibiting the same type of reaction- 

 curve, differ so that one is readily distinguishable from the other. Comparing MararUa with 

 Calathea, it will be found that with the exception of the gentian violet reaction, the reaction-curve 

 throughout is higher; and when compared with the curve of Stromanthe it is throughout distinctly 

 higher. Calathea shows higher reactivity, except in the chromic acid, pyrogallic acid, ferric chloride, 

 and Purdy solution. The differences brought out in the reactions are in accord with the generic 

 classification of the botanist, except in the case of M. musaica, which, according to the peculiarities 

 of the starch, is probably a Calathea. 



aart No. 336. 



CI CA PA FC F S CI PA CA 

 "^ ' ■ ■ ■ PC PS 



Chart No. 358. 



te Curve of Mean Reaction-Intensities of Starch 

 of Maranta. 



60 

 65 



Composite Curve of Mean Reaction- Intensities of Starch 

 of Calathea. 



Ct Oft PA FC P S CI PA CA 



Curve of Rcaction-Intensitiea of Starch of Stromanthe. 



55 



