eae Sti ot 
gdly, This being done, gradually pour the folution of allum 
hot into the alkaline folution alfo heated; a precipitation will 
immediately appear; fhake them well together, and let the 
effervefcence, if any, ceafe before more of the aluminous folution 
be added ; continue the addition of the allum until the mixed 
liquor, when .clear, turns fyrup of violets or paper tinged blue 
by raddifhes, or by litmus, red; then pour the liquor and precipitate 
on a paper filter placed in a glafs funnel, the precipitated earth 
will remain on the filter ; pour on this a pound or more of hot 
water gradually until it paffes taftelefs ; take up the filter and let 
the earth dry in it until they feparate éafily, then put the earth 
into a cup of Staffordthire ware, place it on hot fand and'dry 
the earth until it ceafes to ftick to glafs or iron, then pound it 
and reduce it to powder in the cup witha glafs peftle, and keep 
it a quarter of an hour in a heat of from 470° to 500°. 
4thly, The earth being thus dried, throw it into a Florence 
flafk and weigh it, then put about one ounce of fpirit of falt 
into another flafk, and place this in the fame fcale as the earth, 
and counterbalance both in the oppofite fcale: This being- done, 
pour the fpirit of falt gradually into the flafk that contains the 
earth, and when all effervefcence is over, (if there be any) blow 
into the flafk, and obferve what weight muft be added to the 
fcale containing the flafks to reftore the equilibrium ; fabtrac&t 
this weight from that of the earth, the remainder is a weight 
exacily proportioned to the weight of mere alkali of that par- 
ticular fpecies which is contained in one ounce of the fubftance 
examined ; all befide is fuperfluous matter. 
I HAVE 
