STAINING DISH FOR COVER GLASS PREPARATIONS
F. Macbeth Ende · JAMA · 1916
This simple device is easily made by fixing an ordinary glass ligature spool to the center of a Petri dish. The ordinary cover glass forceps, the jaws of which are usually covered with a film of old dry stain, frequently spoil results by precipitation, leaving a granular residue at one corner of the cover glass, the excess running down the arm. Dishes, while doing away with this and other disadvantages, require a large amount of stain. In making this dish, a few chips of sealing wax are placed in the center of the Petri dish, and it is held over an alcohol flame until the glass is heated and the wax melts. A ligature spool, the end of which is about 1 cm. in diameter, previously heated to prevent breaking, is pressed into the molten wax, which is allowed to harden. If a few drops of water are placed on