Are you aware that plant-food exists in the soil in both avail- 

 able and unavailable forms, and that when plants have used up 

 most of the available portion we call the soil worn out ? 



Is it true that your soil is capable of Ijeing made an active 

 laboratory in which changes will take place and some of this 

 unavailable plant-food be made usable ? 



Are you aware that when the texture of your soil is poor, or, 

 in other w^ords, when your laboratory is out of order, the best com- 

 mercial fertilizers or stable manures will not give the best results ? 



Do you know that heat and air are important agencies in the 

 changes going on in the soil, as they also are in the changes in a 

 barrel of cider or in the yeast in a pan of dough ? 



Does standing water on soil have a detrimental or beneficial 

 effect on the heat and air ? Why ? 



How can vou make the soil laboratory do the best work ? 



Name. 



Post Office 



