( 98 ) 
the results of his observations. Whereas at the time, among the 25$ 
possible combinations, I myself had found only one system l ) in 
which three odours, considered as vectors, could be joined together, 
Hermanides succeeded in finding three such systems. 
The system of Zwaardemaker was that of terpineol, aethylbisulfide 
and guajacol in the proportion 1:18:1 and as such not be construed; 
the systems of Hermanides appear to be : 
A. isoamylacetate, guajacol and valerian-acid in the proportion 
2:1:29. 
B. nitrobenzol, aethylbisulfide and pyridine in the proportion 
1.9 : I : 0.5. 
I C. guajacol, pyridine and scatol in the proportion 1.5:1:24. 
On account of the relative rarity of such constellations and the 
want of agreement between the system of Zwaardemaker and those 
of Hermanides no further inferences can, at least provisionally, be 
drawn from this. 
An important fact, however, is that in the further work some 
identities between vectors for both of us conjointly have been found. 
The subjoined table accounts for this. 
TABLE of the coinciding of two vectors with respect to two others, 
both for Z and for Hs. 
Vectors becoming identical Vectors whose position is given beforehand 
isoamylacetate and guajacol 
aethylbisulphide and valerian acid 
valerian acid and scatol 
valerian acid and scatol 
Also the reciprocity between the proportion of isoamylacetate 
and guajacol on the one side and valerian-acid and scatol on the 
other, previously observed by me, has been found back by Herma¬ 
nides, as a look at the table may show. 
Likewise manifold identity. For four vectors it occurred, just as 
with me, only once and that for the odours: 
*) Through an error in the calculation, Proceedings Vol. XVI, p. 187 note, the 
only possible combination of three vectors in my system has been erroneously 
given. The unique constellation is that of Terpineol, Aethylbisulfide and Guajacol. 
Inferences were not drawn then, nor are they tried now. 
valerian acid and scatol 
guajacol and pyridine 
isoamylacetate and terpineol 
isoamylacetate and guajacol 
