910 
in the Harr-effect, but they showed it very clearly and sometimes 
very strongly at hydrogen temperatures, giving considerable differences 
between fy and Fz. In the following tables twice the asymmetry 
is given by the side of the mean Harr-constant; for the method of 
evaluating the asymmetry we may again refer to Chapter | of Suppl. 
N°. 2. All quantities except w are expressed in C.G.S. 
The current in the main circuit was /= 0.15 amp. A WiIRDEMANN 
galvanometer was used. The bath of liquid gas in the magnetic field 
was obtained in a silvered vacuum vessel by the method of Comm. 
N°. 114. 
§ 4. Results of the measurements. 
Bin Bijz, represent three plates of 10 mm. diameter pre- 
pared from the same Hartmann and Braun electrolytic bismuth. 
Bi,; was compressed from a thin rod in a steel mould. 2,7; and 
Bi,177 were prepared by first grinding the bismuth to a fine powder 
in an agate mortar and then compressing in the same mould as bi,7. 
In the preparation of Bz,777, which was otherwise the same as that 
of Bir and Lizz, the grinding operation took place in an atmosphere 
of carbon dioxide. 
TABLE II 
The Harr constant, asymmetry and resistance change for Bip: 
T = 289° f— 2023 
RH 2x Asym. | —R or RH 2x Asym. | —R (=|, 
2060 || 13.9103 | 0.4103 | 6.75 | 1.06 91.4108 39.6<108 44.35| 10.1 
3450 || 20.9 0.2 6.06 | 1.12 || 166.5 48 48.25) 210 
| 5660 || 29.1 ie 5.147 1.21" 1) 308 54 54.40| 39.3 
7160 |} 33.2 0 4.64 | 1.29 || 385.5 114.5 53.90 52.0 
9880 || 40.3 138 4.08 | 1.45 || 563 199 57.00} 78.2 
11090 || 42.6 23 3.84 | 1.50 || 640 243 57.10) 39,5 
wr= 0.00044 2 
0 w—ap= 0.00209 0 w 
T _ 20K _ 9.99 
Wos0K 
With no field the ratio of the resistance of Bij at hydrogen 
temperature to that at ordinary temperature is almost the same as 
the same ratio for the bismuth wire Big; but in a magnetic field 
