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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 usdoi:10.1038/scientificamerican06011921-522asupp fatcat:pcbvillzqveefn5rxomgp4zk4i