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the teft of experiment, which I did in the following 
.manner. 
Experiment VI. 
'To a pint of diftilled water, mixed with one grain 
^of iron dilTolved (as in Experiment the Fifth), were 
.added forty grains of foap leys. 
And to two ounces of lime-water, diluted with 
fourteen ounces of dhlilled water, was added a grain 
of iron in folution. 
In both cafes the point of faturatlon was intended. 
The two mixtures indantly turned green, grew tur- 
bid, and let fall fediments of the fame colour. The 
liquors, being filtered, gave no tinge with tinflure of 
galls. 
Experiment VII. 
A quart of water was mixed with two grains of 
ironj as before. 
To one moiety, three grains of fait of tartar in fo- 
lution was inftilled. It firft appeared green, foon 
changed yellow, and gave an orange-coloured pre- 
cipitate. 
To another portion two grains of powdered chalk 
being added, it prefently became ftraw-coloured, and 
after continuing nine hours in a well-corked phial, 
was yet turbid, with a yellow fediment. 
The waters being both filtered, part of each 
changed to a purple, with tindure of galls. The 
remainder being boiled, a farther precipitation en- 
fued, and the clear liquor no longer produced any 
alteration with gallsi 
4 
This 
