1 Srpr., 1899. ] QUEENSLAND AGRICULTURAL JOURNAL. 265 
method is common in the analyst's laboratory, no one seems quick to take it up, 
or, rather, think of introducing to the practical dairy. Dr. Bond, of Gloucester, 
was, | believe, the first to suggest its adoption. ~ 
The requirements are certainly some kind of apparatus—a. pipette, small 
porcelain, &¢.—but need not run into a great deal of money unless the reader 
prefer it that way. The simplest form of all the apparatus one can have is simply 
a burette for measuring, a bottle of caustic soda of definite known strength, 
porcelain dish, pipette, glass rod, and indiarubher cork, costing in all some 4s. or 
5s., the solution of phenol-pthalein (soda solution) being extra. This method, 
of course, will do, and will answer fairly well; but the great disadvantage is 
that in pouring the caustie soda each time of using into the burette causes it to 
lose strength. If this way be adopted, great care must be used in keeping both 
the bottle and the burette (if any soda is left in it) corked—the former with a 
elass and the latter with a rubber cork. 
‘Where, however, the test is largely resorted to, it is much better and more 
satisfactory to rig up an apparatus similar to the one IT have drawn, the whole 
affair costing, if you construct it yourself, only 2s. or 3g. more. 
flow Oe 
iat 3 
Air enters Knew Binet 
Srtie akte Cok 
Taste 
CONSTRUCTION. 
No the ingenious it forms interesting work, 
Qvhich can be bent to any shape in an ordinary gas-burner), together with some 
bits of rubber tubing, it is soon rigged up. The ‘D-piece, however, had better be 
bought, as it lies outside the ordinary amateur’s work. It would be best here 
to make a remark or two on how to construct the apparatus. 
The first bottle required I have represented in diagram as a Woullfe bottle, 
but an ordinary small bottle and rubber cork, with two holes to admit the 
glass tubing, will do admirably. This contains a strong solution of caustic soda, 
and is used for drying and purifying the air before it is passed into the bottle with 
solution of known strength, which it would weaken without this preparatory 
drying, 
T 
and with plenty of glass tubing 
