Dr. Hare's Meconic Acid. ats 293 
opin 
“ Casiis HI, and IV, Were the ordinary cases of opium ; 
disagreeing i in any form ; the exbibition of the tincture: in 
Sear in neither case, was followed by. any unpleassat 
eeling. 
“‘ From. this experience, though reap I am led to anti- 
cipate the great. desideratum in the use of opium is obtained. 
With many. thanks for your liberal supply. of the. > for. 
my tri ‘als 
- I remain, as ever, gents ee 
March 25th, 1827. We, Pa. DeweEs/? 
An. easy mode uf obtaining Meconic Acid. By Rs Hare, 
M. D. &e. &c. &e.—lIf to.an aqueous. infasion of, pare ueaiaes 
add pate of lead, a copious 
of lead ensues... This. being collected by.a filter, and expose 
to sulphuretted hydrogen, meconic acid_ is liberated. The 
solution is of.a reddish amber colour, and furnishes, by evapo- 
ration, crystals of the same hue. A very. small quantity,pro- 
ances a very, striking effect in reddening solutions of peroxide 
4 of sulphuretted hydrogen, sulphuric acid may. be 
used.t -meconic | 
mer, in Ahceste: does not.seem.to interfere wi die pone of 
g fe solutions. But any excess of's 
ric ee 2 mos be. removed by whiting, which is not.acted 
on. sensibly by the meconic acid. Yet the acid aon in 
is way, did not crystallize so handsomely, or, with so much 
facility, as.that ebtained by sulphuretted hydrogen. 
