A large-mouth bottle neck is provided with a stopper, having three brass or glass tubes as shown, the tube A being fitted with a thick piece of rubber tubing,

B, stoppered at its lower end. A slit is cut at

C, and allows the air blown in through the tube A to pass into the bottle, but will close automatically and hold the pressure within the bottle.

If the relief tube D is closed with the thumb the water is forced out in A steady stream through the nozzle E. The water will continue to run for some time after the lips are removed from the air tube, but the removal of the thumb from the tube D will stop the flow of water instantly. - Contributed by \V. Schilling, San Francisco, Cal.

Wash Bottle For Laboratory Use 1091