1893 - 94 .] S. Kimura on Electrical Proyertics of Gases. 205 
Finally, I took only one such junction, of which the thin iron and 
thin German-silver formed a thermometric junction, while the 
thick charged wire and the thin iron formed a thermo-electric 
junction. In this manner I tried the above three methods, one 
after the other. The CO-iron line (PI. I. a) was obtained by the 
second method and the COg-iron line (PI. I. h) by the third. On 
comparing the results obtained by the second and the third 
methods with those obtained by the first, I found them to he 
fairly concordant. 
The galvanometer employed was a high-resistance double-coiled 
one. It w^as gauged before each new experiment. In taking the 
readings I observed first, the direct and reverse currents of the ther- 
mometric circuit, then the direct and reverse currents of the thermo- 
electric circuit, and then again the direct and reverse currents of 
the thermometric circuit. These three pairs of readings deter- 
mined by themselves one point in the curve showing the relation 
between the thermo-electric and thermometric deflections. Two 
gas burners of different sizes were employed to make the rise of 
temperature as uniform as possible. This was 9 degrees during 
the three pairs of readings, or five divisions in the scale of deflec- 
tions. The thermo-electric current passed through a resistance of 
1000 ohms, while the thermometric passed through 2000 ohms 
and a shunt of 150 ohms, the resistance of the galvanometer being 
1560 ohms. Curves of cooling were also obtained in each case. 
During the slow cooling I made the necessary calculations and 
drew the curve, so that I did not waste time continuing the experi- 
ment after the intersection of the heating and cooling curves. 
The CO-iron and C02-iron were cut from different samples of 
equal thickness. 
Apart from the main object of the research, I made many other 
experiments. For instance, I compared the thermo-electric currents 
of two pieces cut from the same iron wire, annealed with different 
degrees of care, and found that the thermo-electric line of the more 
carefully annealed wire lies parallel with, and a little below, the 
line of the less carefully annealed wire. The line of a hard drawn 
wire lies, at low temperatures, above that of the annealed wire, and 
comes in contact with it at a temperature of about 250°. This 
shows that the thermo-electric current runs through the hotter 
