. University of Toronto studies. Physiological series. no. 1-98. 1900-28 . described should be employed by those accustomedto the use of the standard burettes or where expense is no object. spectively a 20 per cent solution of NaOH and a 60 per cent solution of KOHwith 10 per cent pyrogallic acid dissolved in it.* Each bulb is connected below by rubber tubing with the overflow bulbs(G and H). A small bulb (relatively smaller than represented in the diagram)is blown on the stem of each absorption bulb to serve as a trap preventing thesolutions from passing over into the burette. The vertical tu
. University of Toronto studies. Physiological series. no. 1-98. 1900-28 . described should be employed by those accustomedto the use of the standard burettes or where expense is no object. spectively a 20 per cent solution of NaOH and a 60 per cent solution of KOHwith 10 per cent pyrogallic acid dissolved in it.* Each bulb is connected below by rubber tubing with the overflow bulbs(G and H). A small bulb (relatively smaller than represented in the diagram)is blown on the stem of each absorption bulb to serve as a trap preventing thesolutions from passing over into the burette. The vertical tube above the crosstubes is closed by the pressure adjuster, which consists, as shown in the smallside sketch in the diagram, of a glass rod beveled at one end and bored mostof the way down the center. At a distance of about 3 mm. from where thebeveled portion joins the tube a lateral hole is bored to meet the channel inthe center. The adjuster is connected by pure-gum tubing with the centraltube of the burette, the beveled end of the former being in contact with the end. of the latter. When the rubber tubing is pinched up opposite the side tube,the burette is brought into communication with the outside and the pressure init remains undistm-bed when the tubing is allowed to fall back into place. The lower end of the burette is connected by thick-walled rubber tubingwith the reservoir (B), and on this tubing are a pinchcock (5) and screw chp(4). About 15 of mercury suffices to fill the apparatus. The reservoir ishung by a loop of wire around the neck on hooks placed on a wooden uprightstand, the higher one being in such a position (marked Jt) that the mercurystands at the end of the side tube (P), and the lower one (marked II) so thatit stands exactly at the mark 0% on the burette. *NaOH may be substituted for K(Jli, l)ul not so satisfactory because of its viscosity. The bestsolution is made by dissolving pure NaOll (electrolytic, if possible) in an e(|ual weight of wate
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