44 DISEASE IN PLANTS. 



wet soils, the root-hairs are killed, and rot sets in. 

 A good instance of this has lately been given by 

 Heinricher in the case of potatoes. 



Notes on Chapter V. 



For the further pursuit of this subject the reader should 

 consult Sachs' Lectures, II. and XV. ; Sorauer, A Popular 

 Treatise on the Physiology of Plants, 1895, chapters II. and 

 IV., and Pfeffer's Physiology, pp. 149-163. The principal 

 paper on root-hairs referred to in the text is Schwarz, " Die 

 Wurzelhaare der Pflanzen," in Unters. aiis dem bot. Inst, zu 

 IVurzburg, I. Heft 2, 1883, p. 140, where a very exhaustive 

 account of these organs will be found. 



