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COPALCHI BARK. 
first crystallization, although, should there be any residue, 
it may be heated, and rubbed up again, with a fresh supply 
for a future operation. The two pellets had better be 
triturated thoroughly in a mortar before the compound is 
submitted to the flame of a spirit lamp; and I have observ- 
ed that, forthe better incorporation, it is necessary to submit 
it to heating and trituration in the usual way, three or four 
times. The cavity of the tooth being quite prepared for 
the reception of the amalgam, all the mercury that can be 
pressed out between the thumb and ringers should be so se- 
parated and the compound immediately packed in the cavity. 
A little nicety is requisite in keeping, by gentle trituration, 
between the thumb and finger, the compound in as hard, and 
at the same time as pasty a state as possible, so as to pre- 
vent it becoming friable or crumbling during its intro- 
duction. — Pharmaceutical Journal, March, 1850. 
ART. — LXIII. — NOTICE OF THE COPALCHI BARK. 
A new and valuable Bitter, analogous to the Cascarilla. 
By James Stark, M. D. 
Fellow of the Royal College of Physicians, Edinburgh. 
In the course of some inquiries into the remedies used in 
Chili and Peru, I received from one of my correspondents 
in Chili a bitter bark under the name of Natri, which was 
stated to be much employed by the medical practitioners 
and natives of Chili in the treatment of intermittent and 
other fevers, and held in higher repute than even Peruvian 
bark itself. The bark and leaves sent enabled me to 
ascertain that the Nam was the produce of a species of 
Croton, but from the want of the flowers and fruit, the par- 
ticular species could not be ascertained. 
