Upon Calorie as a cause of Galvanic Currents. 279 
Positive current and caloric 
movin 
together in opposition. 
: | Remarks. 
cold. hot. | hot. cold. 
- oa eo 
PuatTinum | P.& 
and 
to apcgrmy in Ist column most usual, 
Copper... ..} C&P: | C.& P. She d combination difficult of exhibi- 
The currents not apparent unless at a red 
Silver... . | 8:.&.P 8. &-P hey are not inverted even when 
“$ e gente 
tags 2 L.&P. tte No itn heat = column, even when the 
Tin T.&P Tes thio 
Zine Z.&P Z.&P te The combination of Ist column most power- 
oo" Rees G.& P G.& P 
LL&P No. 1. first column most usua ee 
Iron. ‘le PeL only app arent when the iron acquires a 
ees . full red heat; oxidation nape be voided. 
Mercury...; M.& P. | M.&P Combination in 1st column, most usu j 
ene ees 
Copper ..|C.& C. 5 
id 7 i. 
P 5 gf Z e Ist co mbination most poweeti The 
Silver. ...} 8&0. |S8.&C egg Spe a ee ocala 
Th oe C.& L. | With cold et rd a pereepeble currents. 
Titties ¢ea Tee, same ag 
oe . Zz. & C. red heat “neceaeary for the is de 
old. . 
No. 1. of these combinations ,the 
laa LiEe&?C erful. No. 2. only perceptible when a 
2.C.&1 fine e copper wire is kept red in 
flame and touched, without removal. 
Mercury... | M.&C, | M.&C. 
‘ ILN.& C. 
Nickel... . ‘lo CEN. 
Strver ..[S.&S8. 
» and : 
bua ’ S.&L No Sent perceptible when the silyer is 
Cc @ 
Tithe. eect 8 8. &T Very feeble at all times. 
Zinc. . eee ; No. 2, feeble. 
Gold... 16.4 S.& G. S.& G. 
Iron, . . Be ga No, 1. most powerful 
aN ‘2S3.&1 y 1. powerful. 
1.8. & M. 
Meriqury:. 1+) «ly M&S. 
Nickel. . . S.&N. 1S.&N, 
Lmavs i. L. thi 
and 
Ti : Hot lead no effect; even 9 Sie, requires a 
be eee oe) Toi ; heat nea ar the point of fusi . 
Zine. : pat. 1 7. & Hot lead little or no effec 
Gold. a) Bria? ae Ae G.& L. Hot lead no effect 
spe. Fer Osha i Se ae I. &.L. 
hare Ae eo5  s M. & L. Hot lead litt! ‘ 
ah 2d ; gy ot lead little or no effect 
