230 
made. Two of the legs were filled with inercury and the third was filled 
with cadmium amalgam. Connection was made to the amalgam terminal 
and to one of the mercury terminals and current passed until the cells 
were polarized. Measurements were made by means of the potentiometer, 
and it was found that the E. M. F. between the unpolarized mercury ter- 
minal and the cadmium terminal was normal, while the polarized mereury 
terminal gave a very small value, showing the polarization to be at the 
mercury terminal. Measurements were made between polarized cells and 
unpolarized cells by connecting the two cells together by means of a 
siphon filled with cadmium sulphate solution. In every case it was found 
that the polarized mercury terminal gave low values, while the polarized 
“cadmium terminal gave normal values when connected to unpolarized mer- 
cury terminals, never deviating more than could be explained by concen- 
tration and temperature effects. 
A cell (5) was short circuited for some days and part of the mercury 
Was removed with a pipette, washed and filtered through a pinhole and 
made the mercury terminal of a new cell (6) from which the mercurous 
sulphate was omitted. The E. M. F. was measured from time to time 
and the recovery noted. The following table gives the results. 
E. M. F. 
6) | ©) 
March 95 (lp p: Mi. * ; : $ : 0.1308 0.1290 
March 10, 9:00 a.m..... ty ba AE Ree: aed .1320 1307 
March MO Rab ina, hess arene: . é Lae . 1363 1310 
March LAM al EP, CVS Tes Behe Dec oe anaes oe .1488 . 1339 
March 13, 10:15 a.m... : WM ke f ge ictaz Sout 1675 1322 
March Li Se Ne a eae y Se ae Se eee a oe 1.0222 1317 
March ESR aS phen een Wg et ay a eh a aN RG NE Cn he 1.0242 1335 
May Le HERI SY 5 5 Pa tee Pe, Pa eR MAND BP, ek ORR AT Oy cetre’ 1.0146 0691 
June Sr ssoare BAe eae ee Ae hs the, He, 1.0177 0533 
August 2 ee ce ON Dt alone fie, OR Be ee baa a ork eke d 7 1.0189 -0637 
SepisMbeia vse, Asesuce tera saarac ye aeatea c irae a eee a ae eee ath 1.0150 | 0462 
The above table shows that cell (5), which contained mercurous sul- 
phate, recovered its BE. M. F. in a few days, while (6) remained polarized 
for six months. The results show the E. M. F. in March to be greater 
than the later values. This may be due to the cadmium sulphate solution 
not being concentrated in the early observations or to some constant error 
of the potentiometer. The table shows that the polarization is due to 
