ES 
+ 
4a 
4 
4 3 
R. Bunsen on the Washing of Precipitates. 337 
: cuo 
if, however, circumstances will not permit of its being adapted 
to this purpose, then a fall of 10 or 15 feet is sufficient to fil- 
a small stopcock designed to regulate the flow of water. Sup- 
pose a filled with water and placed upon a shelf as high above 
e ground as possible and a’ placed empty on the floor, and 
may be immediately withd:awn from the funnel and ignited 
without any other preliminary desiccation. The following ex- 
periment,made with a portion of the same solution of chromium 
used in the former determinations, will serve to show the 
saving of time effected by this simple arrangement :— 
Transferring the precipitate with 14 cub. | y4 
centims. of water ack 
For a single addition of 26 cub. centims. | 7 
of wash-water to run through--_------ J 
To drain the precipitate ----------------- 4 
Time required in washing - ----------- 
Weight ot the precipitate. -----.0°2435 grm. 
lume of wash-water- ----- cub. centims 
Pressure in manometer--------- 0-184 meter. 
‘This amount of chromium sesquioxyd (02435 grm.) differs 
i ( 
from the mean of the former experiments (02436 grm.) by one- 
