954 
The compensation is indistinct only for benzol and toluol. We 
also ascertained in every test that in the neighbourhood of the 
compensation-point smell-sensation grows weaker. 
We invariably found the ratios of the cylinderlengths of two 
antagonistic substances to be the same fora particular compensation- 
pair. They appear again when reducing the cylinderlengths to 
olfaction-values. 
| 
Number of olfacts | 
— TE Bic, | —— = Sensation 
Benzol Toluol | | Xylol Pseudocumol | 
| | | 
3 | B 4 | (0) 
6 ME ETE, | | (0) 
12 | 9.7 | (0) 
3 | | 2.5 0 
6 | | 5.6 0 
12 | ibaa beg: 0 
3 | 1.0 0 
6 | 2.0 0 
12 | | 4.2 0 
3 | Bag | 0 
6 | 3e | 0 
12 | 6.5 0 
3 | 1.4 0 
6 | 29] | 0 
12 | 5.5 | 0 
6 3.9 | 0 
10 | 6.6 0 
This investigation, then, confirms the rule previously found by 
ZWAARDEMAKER') for other compensation-pairs, viz. when a olfacts 
1) H. ZWAARDEMAKER, die Physiologie des Geruchs, Leipzig 1895 S. 194. Cf. 
ZWAARDEMAKER the restriction to the domain of cardinal values in Tig. Hdb d. 
Physiol. meth. Bd. Ill 1 p. 89. Beyond the domain of the cardinal values the 
log. of « and b will have to be multiplied. 
