EXERCISE A-31. TO STUDY THE NEED OF THE SOIL 



FOR LIME. 



Equipment; Blue litmus paper; small bottle of hydro- 

 chloric acid. 



Method: (a) Dip the end of one strip of litmus paper 

 into vinegar or hydrochloric acid, and the end of another 



Fig. 27. — A Small Outfit for Crushing and Pulverizing Limestone for 



Use on Acid Soils. 



strip into lime water. What is the result? After thor- 

 oughly washing the hands, make a mud ball by moisten- 

 ing some of the soil to be tested, with distilled or fresh 

 rain-water, and pressing it into shape. Break open the 

 ball, place a fresh piece of the blue litmus between the two 



parts and press them together. After four or five minutes 



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