WEBER'S LAW TO SMELL.
55
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.
Table VI.
Approximate Values of Δr⁄r arranged to show Variations for Different Substances.
PART I. SOLIDS.
| Substance. | Number of cases {equal to or approximating} | Total number of cases. | ||||||
| >1⁄2 (A) | 1⁄2 (2) | 1⁄3 (3) | 1⁄4 (4) | 1⁄5 (5) | 1⁄6 (6) | <1⁄6 (Z) | ||
| Yellow wax. I, | — | 1 | 3 | 4 | 8 | |||
| Russian leather. I, | 2 | 4 | 3 | 5 | 6 | 1 | 21 | |
| Oil of mace. II, | 25 | 11 | 10 | 4 | 50 | |||
| Cocoa-butter. II(?), | 3 | 2 | 5 | 5 | 3 | 5 | 23 | |
| Rosewood. II, | 1 | 10 | 10 | 2 | 2 | 24 | ||
| Cedar. II, | 9 | 2 | 3 | 4 | 18 | |||
| Tolu balsam, III, | 2 | 8 | 6 | 2 | 2 | 20 | ||
| Gum benzoin. III, | 6 | 2 | 8 | 6 | 5 | 2 | 1 | 30 |
| Musk-root. IV, | 1 | 6 | 7 | 2 | 1 | 3 | 20 | |
| Black rubber. V, | 1 | 4 | 5 | 6 | 4 | 6 | 26 | |
| Gray rubber. V, | 2 | 4 | 10 | 5 | 1 | 22 | ||
| Asafœtida. V, | 14 | 6 | 5 | 25 | ||||
| Gum ammoniac and gutta-percha (1) Weaker cylinder fr. Utrecht |
1 | 3 | 4 | 3 | 2 | 1 | 14 | |
| (2) Stronger cylinder fr. Utrecht, | 1 | 1 | 5 | 7 | 1 | 1 | 16 | |
| (3) Home-made cylinder, | 10 | 2 | 1 | 1 | 1 | 15 | ||
| Paraffine. VII, | 3 | 3 | 2 | 8 | ||||
| Glycerine soap, | 2 | 4 | 1 | 1 | 8 | |||
| Total, | 60 | 37 | 83 | 86 | 51 | 18 | 25 | 360 |
| Values for oil of mace, asafœtida, and home-made cylinder of gum ammoniac and gutta-percha | 49 | 19 | 16 | 4 | 1 | 1 | 90 | |
| Final result, | 11 | 18 | 67 | 82 | 50 | 18 | 24 | 270 |
