SYMPTOMS OF DISEASE. 185 



possible, because the loss of water cannot be 

 compensated, and the results may be further 

 complicated by the gradual penetration of poison- 

 ous matter into the cells. It is frequently neces- 

 sary, though sometimes very difficult, to decide 

 which is the primary and which secondary (or 

 tertiary, etc.) symptoms in the order of their 

 importance, and the diagnosis may be complicated 

 by a number of accessory factors which it is im- 

 possible to treat generally. 



Notes to Chapter XIX. 



The principal cases here described are dealt with in works 

 on plant physiology, and in the works of Sorauer and Frank 

 already referred to. 



As regards damage due to uprooting of seedlings by frost, 

 see Fisher, " Forest Protection " (Engl. ed. of Hess' Forst- 

 chutz\ in Schlich's Manual of Forestry, Vol. IV., 1895, 



PP- 439-442. 



On Albinism, see Church, " A Chemical Study of Vegetable 

 Albinism," Journ. Chem.Soc, 1879, 1880, 18S6. 



Beijerinck's results are contained in his paper, " Ueber ein 

 Contagium vivum fluidum," etc. (with English abstract), in 

 Verhandl. d. Ko7i. Akad. v. IVetensch, te Amsterdam, 1898. 

 Koning's paper is in Zeitschr. f. Pfiauzeiikrank., Vol. IX., 

 1899, p. 65. See also Nature, Oct. 11, 1900, p. 576. 



