252 REST-HARROW. 



gested in an equal quantity of wine. Ettmuller highly extols 

 what he calls the " essence," prepared by digesting the whole 

 plant, while in flower, in rectified spirit for several days, then 

 distilling and adding to the distilled fluid a fresh quantity of 

 the plant, together with the alkaline salt obtained from its 

 ashes ; macerating the whole again for several days, and then 

 straining and expressing the clear liquid. He considers this 

 in the dose of half an ounce to two ounces, a specific in cal- 

 culous diseases. The herbaceous part of the plant is less 

 frequently used ; it may be employed however by boiling a 

 small handful in half a pint of water, over a moderate fire, 

 till nearly one half is consumed, which dose is to be repeated 

 every morning. 



