ELECTRO-CHEMICAL EQUIVALENT OF SILVER 
459 
Note to § 30. 
Observations made at intervals since this paper was read may here be given in 
continuation of Tables VII. and VIII. 
June 26. 
July 14. 
July 21, 22. 
Aug . 6. 
Oct . 8. 
Oct . 28. 
Nov. 14. 
Dec . 5. 
Clark 1 . . 
1-0000 
1 0000 
1-0000 
1-0000 
1-0000 
1-0000 
1-0000 
1-0000 
„ 4. . 
•9998 
1-0000 
1-0000 
1-0004 
•9996 
■9997 
o-oooo 
o-oooo 
„ 5 . . 
■9997 
1-0007 
•9998 
1-0006 
•9990 
•9994 
•9993 
•9997 
„ 8 . . 
•9997 
•9998 
•9998 
•9996 
•9997 
•9998 
1-0000 
"9996 
„ 9 . . 
1-0000 
1-0000 
1-0002 
•9998 
1-0000 
1-0002 
1-0002 
■9999 
.,10. . 
1-0003 
1-0003 
1-0003 
1-0003 
1-0003 
1-0003 
1-0003 
1-0003 
„ 11 • • 
1-0003 
1-0004 
1-0003 
1-0007 
1-0003 
1-0003 
1-0003 
1-0004 
„ 12. . 
1-0004 
1-0004 
1-0004 
1-0007 
1-0003 
1-0003 
1-0003 
1-0003 
„ 13. • 
1-0002 
1-0002 
1-0002 
1-0000 
1-0002 
1-0002 
1-0003 
1-0001 
„ 14. ■ 
1-0026 
1-0003 
1-0003 
1-0002 
1-0003 
1-0003 
1-0003 
1-0003 
„ 16. . 
1-0004 
1-0003 
1-0004 
1-0002 
1-0002 
1-0003 
1-0003 
1-0003 
„ 18. . 
•9974 
•9920 
•9900 
•9860 
•9800 
-9810 
•9760 
unsteady 
„ 19. . 
1-0004 
1-0000 
1-0000 
•9997 
1-0000 
1-0002 
1-0001 
•9999 
H 5 . . . . 
1-0005 
1-0004 
1-0005 
1-0005 
1-0003 
1-0003 
1-0004 
1-0006 
Hj. . . . 
1-0007 
1-0004 
1-0005 
1-0005 
1-0004 
1-0002 
1-0003 
H 10 ■ . . 
1-0004 
1-0005 
1-0005 
1-0003 
1-0003 
1-0003 
1-0004 
1-0004 
H n . . . 
1-0004 
1-0005 
1-0005 
1-0003 
1-0002 
1-0003 
1-0003 
1-0003 
h 12 . . . 
1-0030 
1-0004 
1-0003 
1-0003 
1-0003 
H 13 • • ■ 
1-0009 
1-0003 
1-0002 
1-0003 
1-0003 
1-0001 
Some H-cells have been set up Mr. Tiirelfall, with amalgams of known composi¬ 
tion, varying from yy zinc to j zinc by weight. The duration of the test has as 
yet been scarcely adequate, but it appears that the smaller quantity of zinc is sufficient. 
Note to § 32. 
Comparisons of standard Daniell cells of the Post Office pattern sent me by 
Mr. Preece have been made on several days, but did not give satisfactory results. 
The E.M.F. rises about 1 per cent, during the half hour following the placing of the 
zincs and porous cells in the working compartment, and the two specimens differed 
from another about 2-| per cent. The mean values were about 1'081 and 1 056 true 
volts. 
Note 1 to § 37. 
An examination of the recent comparisons of cells of different ages will probably 
lead to the conclusion that no important absolute change of E.M.F. can have occurred 
during the thirteen months; but since the cells have been employed as standards for 
3 n 2 
