f 249 ) 



several vectors conies about, are closely connected with each other. 

 Valerian acid and scatol, with regard to which no less than 4 vectors 

 become identical, have 4 mutual coincidences, to 1% and also the 

 vectors with regard to which the coincidence of three vectors takes 

 place, show in 3 cases out of 4, a plurality of identity. Considered 

 from certain definite points of view, therefore, they must have some- 

 tiling in common in their action upon our consciousness. 



If we ask ourselves what physical importance the relations found 

 might have, it must be this that odour-mixtures formed from the 

 coinciding vectors possess lixants in common and these fixants will 

 have to lie found in the odour-classes to which the vectors with 

 regard to which they are placed, belong. In perfumery are known a 

 number of such lixants rendering useful services with regard to certain 

 definite perfume-mixtures, which otherwise would not be durable. 

 In my "Physiologie des Geruchs" I have given a series of such 

 examples. Here we quote one borrowed from G. Cohn's "die Riech- 

 stoffe". Artificial jasmin is obtained by joining together benzylacetate, 

 linalylacetafe, linalool and benzylalkohol, mixed with some indol, 

 which serves "als Fixiermittel und zur AuflVischung des Geruchs", 

 and which may be replaced by methylketol, scatol, propyldi- 

 methylindol, propylaethylindol, allylmethylindol, etc. With the aid 

 of our table it must be possible to devise mixtures that will furnish 

 available bouquets with fixants to lie specified befoiehand. Their 

 practical fitness for the perfume-industry will depend, besides on the 

 pure compensation-proportions, also on the velocity of evaporation 

 and diffusion of the materials used. In a practically available perfume 

 the latter should not differ too much. 



The multidimensional character of the organ of smelling prevents, 

 alas, projecting a clear representation of all proportions of the different 

 qualities in their action upon consciousness. This is only partially 

 possible, for separate vectors, isolated from the whole. Yet it appears 

 that in general there exists a contrast between 

 isoamylacetate 



nitrobenzol 



\ with regard to { valerian acid 

 terpineol 



guajacol 



From a phylogenetic point of view the first group might be called 

 the food-odours, the second the putrid odours, if not in many a case 

 also muscon should be added to the last category, for which reason 

 it is perhaps safer to refrain from any denomination. The arrange- 

 ment in each group is governed by the above mentioned reciprocities. 



aethylbisulfide 



valeru 



scatol 



