140 
Results oblained from the bark of Yatlhoy <i the following 
Analysis. 
1. I placed in a flask, capable of containing four pints, twen- 
ty-four grains of very fine powdered bark of the root of 
Yallhoy, with six ounces of cold distilled water, and having 
shaken it for a short time, the liquor was converted into a thick 
foam occupying the whole cavity of the flask. The foam re- 
mained in that state for a considerable time, and though after 
opening the flask it began to subside less slowly than when the 
flask was closed, and to re-assume the liquid state, the whole 
did not entirely subside within the flask, even for the space 
of twelve hours; but having placed the fluid in an open dish, 
all the foam disappeared in two minutes, doubtless from the 
greater influence of oxygen upon the liquor when exposed to the 
action of the atmosphere, than when kept close. I returned the 
liquor again into the flask, and as often as the operation was — 
repeated, there resulted the same quantity of foam and the same 
consequences. All which proves the existence of a portion of 
‘saponaceous matter in the bark. 
- The liquor dissolved more than half the weight of the bark, 
and assumed a tint similar to that of depurated whey when fil-_ 
tered without clarification ; and having added a little carbonate 
of potash, it acquired a yellow colour, similar to the Reseda lu- 
teola or woad. With sulphate of iron there was no remarkable 
alteration in the colour, nor any precipitate at the time; but in 
a few minutes a mucous and greyish matter settled at the bot- 
tom of the vessel, and the liquor remained clear. In the resi- 
- due the acrid bitter flavour was perceptible, though in a oe 
degree. © | 
