278 W. Hallock—Smee Battery and Galvanic Polarization. 
ing from which P was caleulated being given under “sec.” 
seconds. I would here remark, that owing to the difference of 
rapidity with which the polarization vanishes for different com- 
binations, the quickest time at which it was possible to read off 
the position of the Heong & after ee the primary current, 
varied from 1 to 5 s s. In columns 18 and 14 are the 
values observed and caleutated by Exner, and the last column 
contains the values newly calculated from the thermo-chemical 
equivalents of J. Thomsen,* which are given in convenient 
form in a table in the last edition of Richter’s Anorganische 
Chemie. The calculations were made according to the scheme 
given in Table IV. 
TABLE IV. 
Se 
Daniell. re 
248-4—198-°3— 50°1 1:00 D. 
H.S0, H,S0,+H,0—H,80, 
210°7 + 68°3—210'7= 68°3 1:36 D. 
HCl HCl 
39°3= 39:3 1-57 D. 
NaCl NaCl+ H,O—Na0H 
96°5 + 68°3 —111°8= 53°0 2°12 D. 
NaOH 2Na0H + H.O—2Na0H 
223°6 + 68°3—223'6= 68°3 1:36 D. 
NaNOst 2NaNO, +3H,.O—2HNO, —2Na0H : 
212 + 204:9—98-2—293-6— 95°5 1:91 D. 
Nal NaI+H,O—Na0H 
10°3 + 68°3—111:8= 26°8 1°07 D. 
Cu(NOs)ot = 7 ae a8 mee i 
52°3 1:04 D. 
‘CuSO, 3 Cus0, + He fa a 4 
198-3 +. 68-3—210°7=— 55:9 1°12 D. 
ZnCly ZnCl, 
112°6= 112°8 2°25 D. 
ZnSO, ZnSO0,+H.O-—H.S0, 
248°4 + 68'4—270°T= 106°0 2°12 D. 
MnClet 2 
123-0 128-0 2°55 D. 
323-0 +204-9— 100-0 2:00 D. 
AgNOst 2AgNO, cE, nad lan, 
46°6 + 68:3—98:2= 8-4 0°34 D. 
97:9 +68:3—98:2— 60 | 1360. 
Values —— with a (t) in tables I and IV are uncer 
tain because o not know what secondary reactions take 
place, nor dad “ know, if and to what extent the secondary 
reactionst affect the eee eas Table II aha the polar: 
ization of 5 per cent H,SO,, 6 per cent HCl and 6 per cent 
sete between the electrodes named in ee first pace other- 
J. Thomsen, Kolbe’s Journ., xi, 18 and xii, 18 87 on 
' Siepee here, Wiedemann Pe AaB aio ii (2), a: “ss, 5 1130-1146, 1874 
the effect of primary and secondary reactions in voltame ! 
