»Prepare Senna Fluidextract as follows.

Mix 1000g of Senna,in coarse powder,with a sufficient quantity (600mLto 800mL)of menstruum consisting of a mixture of 1volume of alcohol and 2volumes of water to make it evenly and distinctly damp.After 15minutes,pack the mixture firmly into a suitable percolator,and cover the drug with additional menstruum.Macerate for 24hours,then percolate at a moderate rate,adding fresh menstruum,until the drug is practically exhausted of its active principles.Reserve the first 800mLof percolate,and use it to dissolve the residue from the additional percolate that has been concentrated to a soft extract at a temperature not to exceed 60.Add water and alcohol to make the product measure 1000mL,and mix.