OEDEMA, OR WART DISEASE. 183 



of spiders cause many of these swellings. When 

 the plant gets into this condition it is practically 

 unfit for flowering, and when badly diseased it is 



55. Oedema, or wart disease. 



very difficult to ever get it into proper shape again. 

 The trouble is one that is brought on gradually 

 by improper relations between the moisture of the 

 soil, moisture of the air, and the light. 



