PLATE 19 



im :iM(l 111). Diiffcnhachin illiislris (pith). 

 Ill and 112. Diijfdiliiirliiii illi(slris (cortex). 



l\'-i and 114. Etloci of chloral hydrate-iodine on the starcli of Diiffoilmchia 

 seguine var. maculata (pith), partial reaction. 



