​TUTSAN, or Park-leaves, Hypericum Androsæmum, L. is an indigenous perennial, growing in woods and moist hedges, where it flowers from July to September.—This vegetable deserves to be more generally known; as it may be advantageously employed for the preservation of Cheese, in the manner already stated, vol. i. p. 502. Farther, as the leaves of the Tutsan assume a red colour, and sometimes yield a red juice, we conceive, they might be converted to some useful purpose, either as a pigment, or dyeing material; by treating them, according to the processes described under the heads of Colouring Matter, vol. ii. p. 38, and Turnsol.