4:70 
As will be seen, the average olfaction-value of our 26 substances 
in a dilution with which the electrifying power is next to impercep- 
tible, is 0.54 cm (determined after the minimum perceptibile without 
quality). The deviations vary within the tenfold of the mean values. 
Apparently the liminal perceptibility of smell-capacity, concurs 
approximately with that of electrifying power. There is, indeed, a 
certain latitude of variation in the olfaction-values, while the electri- 
fying power is considered the same for all, though probably it is 
not quite the same, because it is difficult to distinguish differences 
of subdivisious of one tenth of a scalemark. 
One of us surmises that both the intensity of the smell and that 
of the electrical phenomenon depend in a more or less complicate 
way on 
a. the volatility of the substances 
TABLE Ila. TABLE IIb. 
Arrangement of 26 odorous substances ; 
(in the stalagmometer) in a solution 26 odorous substances arranged according 
yielding a just noticeable electrical to their boiling point. 
charge. (at 15° C.). 
Water 49.3 Water 100° 
Naphthalin 49.3 Benzol 809 
Artificial moschus 49.6 Allylalcohol 97° 
Caproic acid 49.8 Toluol 111° 
Anilin 50 Iso-amylacetate 116° 
Indol 50 Amylalcohol 116.3 
Nitrobenzol 50 Pyridin 116.7 
p. Xylenol 50 Xylol 142° 
p. Toluidin 50 Caproic acid 155° 
Guaiacol 50 Pseudocumol 169.8 
Thymol 50.1 Anilin 182.5 
Allylalcohol 50.2 Valerianic acid 184 
Toluol 50.2 o. Toluidin 199.7 
Pseudocumol 50.5 p. Toluidin 200.4 
Amylalcohol 50.5 Nitrobenzol | 205 
m. Xylidin 50.5 Guaiacol 205.1 
m. Xylenol 50.6 Terpineol 218 
Benzol 50.8 Naphthalin 218.2 
Vanillin 51 p. Xylenol 220 
Valerianic acid 51 m. Xylenol 225 
Terpineol Dl2 m. Xylidin | 226 
o. Toluidin 52 Thymol 231.8 
Skatol 52.2 Cumidin 235° 
Cumidin 52.2 Indol 253 
Iso-amylacetate 52.5 Skatol 265 
Pyridin 54 Vanillin sublimes 
Xylol 55 Artificial moschus cas 
Average 50.9 eee 
