by means of Potassa and Ferridcyanid of Potassium. 371 
centrated to a syrup, in the water- bath, and then mixed with a 
great volume of absolute alcohol; by which a thick floceulent 
nearly bie precipitate of an organic potash combination result- 
coholic solution was filtered off from it, and evapora- 
ted to pees Be the residue consisted chiefly of acetate of potassa 
scarcely mixed with other organic substance ; oxalic acid and urea 
were not found. The flocculent substance ‘precipitated $25 alco- 
hol was solved in a small quantity of water, and only a rops 
were sufficient, to convert it into a syrup; after all cutie: it 
seemed to be perfectly identical with the above mentioned impure 
lantanurate of potassa. The solution had an acid reaction, and 
afforded’ with acetate of lead an abundant white ge in 
every respect like the lantanurate of lead, already deser his 
solution ought to contain neutral, or acid lantanurate of potassa } 
hence the following way was chosen to obtain one of these po- 
tassa combinations fit for analysis. The syrup-like watery solu- 
tion was very cautiously mixed with alcohol, till a slight bin 
ness "presented itself, indicating the precipitation of the pota 
salts e weak alcoholi i¢ solution was then left to itself; by 
and by, after a long time; erystals and crystalline crusts began to 
deposit ; from time to time a new quantity of alcohol was ‘added 
by which a new impulse was given to the crystallization. Finally, 
the crystallization terminated; whereby the liquid became more 
and more neutral, and lost its acid reaction. 
The separated ‘crystals were bilantanurate of potassa, as will 
be seen oF the result of the following analysis. ‘They were pu- 
rified by repeated crystallization out of water; and the attached 
ellow coloring matter became by and by insoluble, and could 
be hag: by filtration. 
e pure bilantanurate of potassa crystallizes out of the wa- 
tery solution in hard crystalline erusts, which consist of an 
gregation of very strong shining white tabular crystals; it is ith 
uble in 8—10 parts of cold, and in much less hot water, but it very 
slowly erystallizes out of the hot saturated solution when coo ed; 
it is insoluble in strong alcohol. [added a smal! quantity of al- 
cohol to the ‘watery solution, and it directly became milky; but 
after a short time it cleared up again, aud the bilantanurate of 
potash deposited itself in small dazzling white voluminous acicu- 
lar crystals. ‘The solution of this salt | gives with acetate of lead 
no precipitate ; but after addition of alcohol, there results a thick 
perfectly white EM alien which disappears 7 after addition 
of more water ; 5 peo nt which is af- 
ter this easily soluble in water and insoluble in caer there 
also results a thic it ulent precipi 
lead, if ammonia is added to a mixture of bilantanurate of po- 
tassa and acetate of lead, or if the former is precipitated with 
basic acetate of lead. With nitrate of silver on the addition of 
