The Fragrance of the Earth

1921 Scientific American  
their increasing radiations in the following scale, bitter, salty, sweet, and acid. But since alkalies when strongly concen trated are bitter and since the insipid taste is the complement of the salty taste, we obtain eventually, arranging them accord ing to their increasing radiations, the following scale: bitter, alkaline, salty, sweet, acin, insipid -the last three tastes being the complements respectively of the first three. Donath's extinction spectrum of chlorophyll (J<'ig. 3) enables us
more » ... 'ig. 3) enables us to calculate the period of tastes. This substance occasions a persisting sensation of bitter following a first sensation of salty. Starting with A = 0.75 p., this spectrum exhibits a series of undulations which gradually neutralize each other. All the A of maximum energy which concur with the bitter are distants of the ratio 1.185, i.e., of the di-meride; the di-meride, practically '\4 of the octave, is the period, therefore. The fi rst maximum has place for A = 814.6 p-/-'; the originrul A therefore, is 814.6 ILIL/1.185 = 6.87.3 ILIL; this is the tonic common to tastes and to odors.
doi:10.1038/scientificamerican06011921-522asupp fatcat:pcbvillzqveefn5rxomgp4zk4i