344 
PEOFESSOE 0. MASSON ON IONIC VELOCITIES. 
when the boundary was crossing a scale division have been used in drawing the 
curves. The walls of this tube were rather thicker than is advisable, since it is 
important to maintain free thermal connnunication between the jeUy and the hath. 
Nearly centims. at each end of the tube were hidden in the ceU neck, so that 
readmgs, after the start, could not he made till the boundaries reached that mark. 
The Battery employed consists of 48 cells of zinc | potash | coj^per oxide, arranged 
in one series and giving about 40 volts. It is very constant, whether in use or not, 
even many months after setting up. The current, in the experiments quoted, varied 
from about 2 to about 13 milliamperes. 
The Time for an experhnent, from the starting of the current till the meeting of 
the boundaries, varied from nearly three hours to over seven. The tube was under 
constant observation. Time readings were made to the nearest quarter-minute. 
Table I.—Experimental Results. 
Salt. 
n 
it 
V 
P 
C, 
V 
U + V 
(L^ + V) 
NH 4 CI 
1 
1-041 
•490 
•508 - -517 (H) 
1-005 
•5 
1-021 
•495 
- 
1-017 
KCl 
1 
1-041 
•490 
•503--516 (H) 
1-032 
3 
1-069 
•483 
1-014 
•5 
•671 
•598 
1-023 
NaCl 
1 
•681 
•595 
•622--648 (H) 
1-013 
2 
•703 
•587 
1-022 
LiCl 
•5 
1 
•456 
•471 
•687 
•680 
•674- -773 (K) 
1-004 
1-013 
1 K 2 SO 4 
■5 
1 
1-143 
1-143 
•467 
•467 
•498 - -499 (il) 
1.002 
•951 
4 NaoSOa 
•5 
1 
•765 
•765 
•567 
•567 
•634--641 (H) 
1-005 
•950 
•5 
•538 
•650 
1-021 
-J- Li2fe04 
1 
•508 
•663 
•595 - -649 (K) 
1-006 
2 
•515 
•660 
•907 
•5 
•463 
•684 
•942 
4MgS04 
1 
•422 
•703 
•656 - -762 (H) 
•861 
2 
•442 
•693 
i 
•807 
