+ 
of Picric Acid to detect the Presence of Potash. 77 
A solution containing 5 per cent anhydrous carbonate of soda ti 
with alcoholic solution of picric acid, an immediate abundant pre- 
ag in 10 minutes the tube could be ats without 
ing the contents. 
spi 
with solution picrate of soda, an ey ye precpiye becoming in 
e course of an hour a very dens 
A solution containing 24 per cent atinininte of soda 
‘with alcoholic picric acid, a slight precipitate frisrendfad very much 
standing, so that after 18 hours the tube could be invert- 
ed without spilling the contents. 
with picrate of soda, non 
A solution containing 1 pari cent carbonate of soda gave 
with alcoholic picric ~ slight precip. after 18 hours repose. 
with alcoh. picric acid, immediate dense pre 
solution containing 2} p. c. sulph. ammonia gave 
- with alco - picrie on egetins dense precip. 
solution containing 1 p. c. sulph. ammonia gave _ 
with alcoh. picric acid, immediate dense precip. 
“ solution picrate soda, immediate slight precipitate. The solu- 
tion on standing gave a beautiful crystallization of long 
needles with ber Ried of colors, exactly resembling the 
reaction of potash sa 
picrate magnesia, by “vine standing, a very faint precip. 
picrate ammonia, - ne. 
solution soto zip anh. sulphate ammonia gave 
with alcoh. pieric acid, after a short interval an abundant precipitate. 
— containing =}, anh. sulph. ammonia gave 
alcoh. picri¢ acid, after a short pyr a oe precip. 
iction containing yo'gy anh. sulph. a 
with a Sa acid, no slelpleath, pe ata twenty-four hours’ 
“ 
its 
_B Lim oe ee — respect to indications of diluted solu- 
tions of alcaline picra 
A solution of picrate os ammonia in 200 parts water gave—with an 
equal volume of strong solution of carbonate of ammonia, an immediate 
precipitate of small yellow needles—in 10 minutes a considerable fies «0 
ty settled at the Arma of - vessel. 
The son to _ pk ie thes results is, 
That. alcoholic solution of picric ueous ; oe of 
picrate of soda will produce a Asin stnie weve won" most any alcaline 
oo 
