OF FLORA. 187 



Bones calcined to whitenefs, of each half 

 a handful; beat the whole together, and 

 fift the Powder through a very fine fieve. 



225. Grey Powder. 



To the Refiduum of the preceding 

 add a little Starch and Wood-afhes 

 in fine powder ; rub them together in a 

 mortar fome time, and then lift through a 

 fine hair fieve.. 



226. Another. 



Take the Marc or Refiduum of the 

 White Powder, mix with it a little 

 Starch, Yellow Ochre, and Wood-afhes 

 or Baker's Coals to colour it. Beat the 

 whole well in a mortar, then fift it through 

 a hair fieve. Beat the coarfer parts over 

 again, and fift a fecond time ; repeating 

 thefe operations till all the compofition has 

 palled through the fieve. 



