Page:Eleanor Gamble - The Applicability of Weber's Law to Smell.pdf/59

Rh It will be seen that there is very little variation in the value of $Δr/r$ from class to class of substances. All of Zwaardemaker's classes are represented among either the solids or the liquids except Class IX, that of nauseating smells. We could not obtain Anagyris fœtida or Indian stink-wood (“Scatolholz”) in the American market, and we did not try soon enough to get it from Eerope. Variations in the results of individual subjects are, however, due to variations in the substances used.

VI. Approximate Values of $Δr/r$ arranged to show Variations for Different Substances.