TESTS FOR ACIDITY 



This test is simple and inexpensive, and 

 at the present time most county agent offices 

 are equipped with this apparatus or a simi- 

 lar one for testing soils for farmers. Some 

 newer methods are being devised, and 

 doubtless this method will be improved 

 upon as time passes, but the Truog test has 

 qualities of accuracy and simplicity which 

 will always make it valuable. 



