Chemical Affinity in terms of Electromotive Force. 211 
209. The following is a list of the cells examined, in which 
the value of k,—, is opposite in sign to, and numerically 
greater than, Ey; so that the current actually generated 
flows in the direction opposite to that predicable from the rela- 
tive heats of formation of the electrolytes :— 
Combination. ™m. E. Ex: EK-— E, =k,—,,. 
Iron-cadmium-sulphate .... Ol tol0 |—-073 to —:035) + °075 |—-110 to —-148 
Tron-cadmium-chloride "25 — 157 + -082 — ‘239 
lron-cadmium-bromide ...| "25 —'103 + :054 — ‘157 
Zinc-aluminium-sulphate ...| a +537 — ‘982 +1:519 
Zinc-aluminium-chloride... 25 +280 — 1-008 +1:288 
Zine-aluminium-bromide... “25 +°296 —1-008 +1:304 
_ Copper-silver-chloride. 
AgCl suspended a "25 —-020 — 174 
ZnCl, solution ...... : 
) Copper-silver-chloride. A ites 
AgCl suspended in “25 — 010 — 164 
CdCl, solution ...... 
_Mercury-silver-nitrate ...... 25 | — ‘004 + '688 — ‘692 
_Mercury-silver-chloride. Be : pee 5 
_ Both suspended in ZnCl, = wee Fs 920 =7 2a 
_Mercury-silver-bromide. : : “<7 Ke 
_ Both suspendedin ZnBe, j = ee: Estar etd 
'Mercury-silver-iodide. OF : E 
_ Both suspended in ZnI, } =i ek ieee aoe 
_Mercury-silver-chloride. 
_ AgCl suspended in ZnCl, | ‘25 — “058 \ (— °583 
| Hg,Cl, Ps CdCl, | 
_Mercury-silver-chloride. 
_ AgCl suspended in cad} “25 — 038 | | — 563 
| Hg,Cl, x ZnCl, b+ -525 4 
_Mercury-silver- chloride. . te See 
Both suspended in caci, |} 2 pia | ~ 8 
| Mercury-silver-chloride. 
_ AgCl suspended in Zn} "25 —‘167 y, — 692 
| Hg.Cl, > HgCl, 
Lead-mercury-chloride. 
_ Hg,Cl, suspended mf 05 — 549 | — “694 
| J) See : 
Lead-mercury-chloride. | + 145 
Hg.Cl, suspended i} ‘05 —*539 — ‘684 
pee eee 
Lead-mercury-bromide. 
_ Hg,Br, suspended in ‘037 — “402 + 306 — “708 
| oe ie 
-Lead-mercury-iodide. a: Cay. : é 
| Both Sepaded in ZnI, \ 025 at + “190 on ae 
210. The following is a list of the cells examined in which 
the value of k,—k, is of the same sign as Ey; so that the 
H.M.F. actually set up eaceeds in numerical value that pre- 
dicable from the relative heats of formation of the electro- 
lytes ; only those cells are named where the excess is somewhat 
considerable, 7. ¢. 0°1 volt or upwards. 
