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isoamylacetate-olfactometer 
16% 
nitrobenzol- 
40 „ 
terpineol- 
20 „ 
muscon- 
24 „ 
aethylbisulfide- 
10 „ 
guajacol- 
20 „ 
valerianacid- 
18 „ 
pyridine- 
12 „ 
scatol- 
23 „ 
absolute measure the minimum 
MANiDEs answers to: 
perceptibile of Her- 
for isoamylacetate 
9.10 ‘ grammes per Liter of air 
„ nitrobenzol 
412.10-’ „ „ „ „ „ 
„ terpineol 
185.1<r* „ „ „ „ „ 
„ aethylbisulfide 
310-’ „ „ „ „ „ 
„ guajacol 
37.10“’ „ „ „ „ „ 
„ valerian acid 
21.10“’ „ „ „ „ „ 
„ pyridine 
1625.10-' .. 
„ scatol 
35 -io -s „ „ „ „ „ 
Mr. Hermanides has joined together his 9 standard odours in all 
possible combinations and tried a compensation. By alternately 
rendering one of the two stimuli weaker or stronger he determined the 
quantitative proportion, for which the blended odour either entirely 
disappeared, or approached to zero in the double olfactometer, first 
in case of unilateral, afterwards also with bilateral supply. That 
the blended odour approached to zero, was assumed to be the 
case, when in the combination only an extremely weak indefi¬ 
nite odour was observed. The whole number of combinations each 
of 2 odours examined in this way amounted to 72. Each mixture 
repeating itself twice in unilateral observation, 36 combinations 
were thus formed. The proportional numbers met with for these, 
are taken together in the subjoined table, whilst the table taken 
from my first communication regarding odour-affinity, to render a 
comparison possible, has been placed by its side. The odour-stimuli 
are expressed in olfactions and each time the proportion — is given, 
in which for each combination the quantities had been mixed. 
7 * 
