PT - JOURNAL ARTICLE AU - WILFRID MARSHALL TI - COLOUR VISION AFTER INTRAVENOUS INJECTION OF SANTONIN DP - 1928 Jan 01 TA - Journal of Pharmacology and Experimental Therapeutics PG - 189--204 VI - 32 IP - 3 4099 - http://jpet.aspetjournals.org/content/32/3/189.short 4100 - http://jpet.aspetjournals.org/content/32/3/189.full SO - J Pharmacol Exp Ther1928 Jan 01; 32 AB - The experiments prove that violet vision and yellow vision are concurrent and dependent. Violet vision is primarily affected and violet light is experienced in the dark-adapted eye. The action is regarded as associated with the mechanism of the perception of "self-light" and is compared to physiological fatigue of violet perception. The seat of action is probably retinal. It is suggested that the action is due to a transformation of santonin to some other substance, probably the allied coloured compound. The bearing of the photo-electrical theory on santonin xanthopsia is discussed.