

a 
hitherto been exclusively con- 
~ IMPORTANT NEW EXPERIMENTS 141 
ofa lipped measure (Fig. 5) having a rather narrow 
orifice, which can be easily covered by the thumb so 
as to allow its contents to be = 
shaken for the thorough ad- = 
mixture of each quantity of 
liquor potassze with the urine 
to which it has been added. 
These experiments have 
ducted with my own urine; 
and I have generally found 
that which was passed in the 
morning before breakfast very 
suitable for use. This fluid 
has remained clear after boil- 
ing, no phosphates being 2—}ll_ - 
deposited during the process; 7 |, 
its acidity has usually been 
neutralised by 10-14 minims 
of liquor potassee per ounce ; 






L ; ; FIG, 5. 
and its specific gravity has Lipped measure for admixture 

varied from 1020 to I02 5. of liquor potassze with urine. 
When the acidity of the urine with which experi- 
ment is to be made has thus been accurately deter- 
mined, one can easily settle which set of the already 
prepared liquor-potassee tubes it will be most con- 
venient to employ. I have generally made use of 
about one ounce of urine for each experiment ; and, 
after numerous trials, have found it best in this 
allowed to fall on dry turmeric paper. As the fluid is absorbed by this 
partly bibulous paper, a faint brown circle is seen for a moment or 
two when the fluid is very faintly alkaline, 
