JoLy—On the Conservation of Mass. 43 
(7). Heb. 1st, noon.——CuSO,, 20 grms.; H,SO,+H,0, 20 c.c. 
Readings: 50, 56, 42, 38, 33, 29, 25, 
AO, AG, 1, FB, Oy by B, & ® Il, de, & G. 
ty Wy Gy GB B, Il, Gy Wil, ile, BB, BO, AG, 2%, 
00, 05, 61, 67, 71, 75, 78, 80. 
In this experiment a new glass vessel 
SOLO OCc 
SSOCCAE 
was in use, the one used in the former 
experiments having been broken. It 
was found by trial that 55 ¢.c. take only 
30 seconds to fall from upper to lower 
compartments. The curve shows that 
a marked perturbation occurred at the 
time of descent of the liquid, the west- 
ane erly motion being changed to easterly ; 
Seen 
but this again changes to a westerly, 
which, at a somewhat faster rate than 
the original westerly motion, persists 
for five minutes after the mixing of the 
substances. There is a possibility that 
the easterly bend was not introduced 
by any effect arising directly from the 
experiment. If so, its brief persistence 
would point to a westerly force arising 
on the solution. 
