64 PLANT DISEASE 



food influences immunity or susceptibility in 

 animal life eating it. 



Lecture on the Physiology of Plants, by Julius 

 von Sachs, translated by H. Marshall Ward, 

 F.R.S., etc., on page 326 says 



"It is now decided that all the various 

 carbohydrates, fats, and proteid substances of 

 the plant are derived from the starch assimi- 

 lated in the chlorophyll. This is practically 

 equivalent to saying that all the organic sub- 

 stances necessary for the construction of the 

 cells and organs of the plant are to be referred 

 to the activity of the assimilating chlorophyll, 

 since the plant requires for the construction 

 of cells and organs generally only these three 

 groups of materials." 



Epidemics , Plagues and Fevers : their Cause 

 and Prevention, by Hon. Rollo Russell, on page 

 374 says 



" Predisposition may be hereditary or ac- 

 quired, and may obviously depend on several 

 peculiarities, such as the character and the 

 ingredients of the blood." 



