on a Permanent Electric Current. 175 
Gold Foil, No. 5. ; 
The metal in this plate was, I believe, either “soft,” or ‘‘ semi- 
cohesive.” 
Length of strip when weighed = 8°49 cm. 
Width - 5 = about 3°28 “ 
Area including projections = 30°0 
‘oa — 
“ sq. 
g °1122 grm. 
Thickness ‘000188 em. 
This strip after being placed on the glass was trimmed down 
to a width of about 2°32 cm., and the mean thickness of this 
strip was no doubt quite different from the value above ob- 
tained. This strip was reduced in width after being weighed 
more than any other that has been used, and this fact may 
account for the discrepancy between the results obtained with 
it and those obtained with the strips of No. 6, already de- 
seribed, and of No. 4, which is to be described next. 
With No. 5 were made four series of observations, resulting 
thus : 
‘ Mx V 
M. C. EF’ 
Mar. 8th, 6400 k X tan 42° 26’ 161 & 10" 
. 6330 ge ore. pers 4 168 60%. 
“10th, 6440 oS wie. kes |g ROR 0%. Ss 
Seay Sc esi cee OF 14d uide x 
Mean = 1625 X 10° 
The next plate used was 
Gold Foil, No. 4 (soft). 
Length when weighed . 2 OF OM, 
Width . —— et ary 
Area including projections saae sO 7 Oe: 
Weight = ‘0478 grm 
Thickness = ‘000134 cm. 
With this plate four series of observations were made in one 
The results obtained March 12th were 
Mx V 
M. C. log 
6480 kX tan 22° 21' 155 & 10"° 
. vg “ 96° 25 EBD ee cay a 
-_ 49° 316’ gH es ees 
= = “6 98° 43’ RGM a alt bey 
Mean = 1545 x 10° 
Measurements had now been made with three plates of gold 
foil, and, considering the irregularity likely to be produced b 
the impossibility of determining accurately the effective thick- 
ness of the strips, the results seemed to agree satisfactorily, 
