FUNDAMENTALS OF AGRICULTURE. 



COMMON FIELD MUSHROOM. 



they feed, absorbing nourishment from them. They 

 are saprophytes or parasites, i. e., do not make their 

 own food and have no need of light. The plant dis- 

 eases that cause the most injury to the farmer are due 

 to fungi. The things we call puff balls, toadstools, 



