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SELECTED ARTICLES. 
of a dark green colour, studded with yellowish points which 
were most evident at the bottom of the mass. When treated 
with cold rectified alcohol, part was dissolved, leaving as a 
residue a fatty substance having some analogy to wax. 
The alcoholic tincture was filtered and evaporated by a gentle 
heat to the consistence of an extract; this was treated with cold 
water, which appeared to have no action on it, boiling water 
on the contrary became tinged of a bright yellow and acquired 
a very bitter taste; this solution was poured oft' from the green 
insoluble residuum, which was washed with an additional 
quantity of boiling water, and then dissolved in alcohol to 
which it imparted a beautiful green colour; it has no taste and 
appears to have all the characters of chlorophylline. 
The aqueous solutions were united and filtered whilst hot; 
they were transparent, of an amber yellow colour, and bitter 
taste; they were evaporated to the consistence of an extract; 
this was dissolved in absolute alcohol, and the solution evapo- 
rated, leaving a resinoid substance of a light colour and very 
bitter taste, which I am persuaded is the guacine spoken of 
by my brother. 
Treatment with Alcohol. The guaco which had been sub- 
jected to the action of ether, was then treated with alcohol at 
36° as long as this had any effect upon it; the tincture was 
somewhat green, and slightly bitter; it was evaporated to dry- 
ness, and the residue, on being treated with boiling water and 
alcohol, furnished a small quantity of guacine. 
Treatment with Water. The same portion of guaco was 
then treated with boiling water to which it imparted a dark 
brown colour and somewhat bitter and very astringent taste; 
on evaporation an astringent substance was left which I con- 
sidered to be tannin mixed with extractive matter. 
Incineration. Thiry-two grammes of guaco were incinera- 
ted in a platina crucible, and afforded four grammes of grey 
ash, of a very saline taste, which on being treated with alco- 
