FORTIETH ANNUAL REPORT. 189 



land on which cover crops are grown. It is associated with the use of 

 green manures and cover crops. 



Question. Will you please explain regarding the shell lime and rock 

 lime advertised. 



Prof. Waite : It is lime that is not fit to sell any other way. I under- 

 stand that is in a ground form. Shell lime is a good lime. On certain 

 light sandy loams, they find that the ground lime stone or air slacked 

 lime is better than caustic lime. Ordinarily the caustic lime on sour 

 swamp and humus laud would be better. Don't get deceived. When you 

 take a pound of dry stone lime and allow it to slake with a little moist- 

 ure, you have two pounds of slaked lime, because it has absorbed the 

 water and carbonate of lime, so when you buy this kind you are paying 

 for water as well as lime. 



