I found various quantities according to the age of the stem. The older portions yielding as much as 0.1021 per cent, while the young portions only gave 0.0654 per cent. The leaves yielding according to their age, 0.0936 and 0.0315 per cent.; and the cones also gave varying amounts, according to their maturity, the amounts varying between 0.0774 and 0.0293. Two methods were used in the quantitative estimation of the amount of phenol. The first was the new volumetric method of M. Chandelon (_Bulletin de la Societe Chemique de Paris_, July 20, 1882; and _Deutsch-Americanishe Apotheker Zeitung_, vol. iii., No. 12, September 1, 1882), which I have found to be very satisfactory. The process depends on the precipitation of phenol by a dilute aqueous solution of bromine as tribromophenol. The second method was to extract, as already staled, a known weight of each part of the plant with water, until the last extract gives _no_ violet color with ferric chloride, and no white precipitate with the bromine test (which is capable of detecting in a solution the 1/60000 part of phenol). The aqueous extract is at this point evaporated, then ether is added, and finally the ethereal solution is allowed to evaporate. The residue (phenol) is weighed directly, and from this the percentage can be ascertained. By this method of extraction, the oil of turpentine, resins, etc., contained in _Pinus sylvestris_ do not pass into solution, because they are insoluble in water, even when boiling; what passes into solution besides phenol is a little tannin, which is practically insoluble in ether. From this investigation it will be seen that phenol exists in various proportions in the free state in the leaves, stem, and cones of _Pinus sylvestris_, and as this compound is a product in the distillation of coal, and as geologists have to a certain extent direct evidence that the flora of the Carboniferous epoch was essentially crytogamous, the only phaenogamous plants which constituted any feature in "the coal forests" being the coniferae, and as coal is the fossil remains of that gigantic flora which contained phenol, I think my discovery of phenol in the coniferae of the present day further supports, from a chemical point of view, the views of geologists that the coniferae existed so far back in the world's history as the Carboniferous age.