ELISHA MITCHELL SCIENTIFIC SOCIETY. 33 



the use of the ordinary wash-bottle, can now be done with much 

 more facility and in a much shorter time. 



It consists essentially of a thin glass flask, C, placed about three 

 feet abov^e the level of the working desk, closed by a three hole rub- 

 ber stopper. Through one of these holes issues a rubber tube, D, 

 (or glass with rubber connections) from the bottom of the flask de- 

 scending to the desk and ending in a glass nozzle. Connection is 

 made by a second hole in the stopper with a reservoir bottle, A, 

 placed above the top of the wash bottle. In the third hole is placed 

 a glass tube bent at an angle to keep out dust. On filling the flask 

 from the reservoir — the flow being stopped by a pinch-cock — the 

 water is started by suction from below, and the stream through the 

 nozzle can be regulated or stopped at will by a pinch-cock placed 

 conveniently to the hand, the height of the flask furnishing the 

 pressure which is sustained by the siphon. A bunsen burner, H, is 

 placed underneath the flask, and the water can be heated when it 

 is so required — the open tube, I, allowing for the escape of steam. 

 Hot water as well as cold can thus be used in treating precipitates. 

 Other solutions can be employed equally as well as water, (see bot- 

 tle F.) 



The advantages of this system are: 



1st. The saving of much time and the consequent labor attending 

 the use of the ordinary wash bottle, especially where several analy- 

 ses are carried on at the same time, the exertions required by the 

 mouth and lungs being thereby avoided. 



2d. No air exists in the tube as in an ordinary wash bottle, and 

 consequently the full force of the liquid is utilized immediately. 



3d. Precipitates can be washed and small flasks cleansed much 

 more satisfactorily than by the old system. 



•4th. When used with a wash solution of ammonia water no trouble 

 is experienced with the free ammonia which ordinarily is quite hurt- 

 ful to the mouth and eyes. 



The large bottle E, with the accompanying tube, shows a con- 

 venient arrangement for holding any solution and delivering the 

 same. 



Laboratory of the N. C. Aj. Eicpt. Station, Raleigh. 



