Practical laboratory tests for the identification of proteus strains.

(3) A return tube from the glass dome leads back to the top of the chamber. Air displaced from the chromatography tank by the incoming fluid escapes through the hole in the glass plate into the dome and passes via the return tube to the chamber, thus forming a completely closed system. Added rigidity is afforded by mounting the apparatus on a "tufnol" plate, to which the glass chamber, stopcock, and rotary switch are firmly secured.