174 



most readily in water, little in aqueous, scarcely in absolute alco- 

 hol, not in chloroform ; yields with nitric acid nitro-compounds 

 and a little oxalic acid ; is not altered by diluted sulphuiic acid, 

 even on boiling; becomes black with sulphuric acid poured rapidly 

 on it, but dissolves when brought into contact with it gradually 

 and with a moderate heat ; does not ferment with yeast, is not 

 altered when boiled with potash-ley, ammonia, baryta, alkaline 

 tartarate of copper, or chloride of iron. 



PillOC01Tetill=:C24 Hi9 O5 (isomeric with Quinovic acid). In 

 the bark of Pinus sylvestris. Boil the bark freed from the outer 

 layers, with alcohol of 40%, remove by filtering the ceropic acid 

 which forms in the decoction on cooling; evaporate most of the 

 alcohol, mix the remnant with water and precipitate the turbid 

 liquid with acetate of lead, throwing down pinocortannic acid and 

 Pinocorretin, while cortici-pinotannic acid and sugar remain dis- 

 solved. The Avashed precipitate of lead, when treated with very 

 dilute acetic acid, separates into pinocortannic acid, which dissolves 

 (and may be obtained from the solution by precipitating with sub- 

 acetate of lead, decomposing the deposit with sulphuret of hydrogen, 

 and evaporating the tiltrate undei- exclusion of the aii') into a 

 glutinous, dark residue, which has to be dissolved in strong 

 alcohol, and is to be treated with sulphuret of hydrogen and 

 filtered off from the sulj^hide of lead. The filtrate, on evaporating, 

 leaves Pinocorretin, to be purified by dissolving in alcohol, filtering 

 and evaporating the liquid. The solution, containing cortici- 

 pinotannic acid and sugar, is freed from the former by precipi- 

 tating with sub-acetate of lead, which forms cortici-pinotannate of 

 lead. — The Pinocorretin is a black-brown, glutinous mass, almost 

 completely soluble in ammonia. 



Pinocortaimic Aci(l=C32 H19 O23. In the bark of Pinus 

 sylvestris. As to preparation, see Pinocorretin. — Red-brown 

 powder, after drying very scantily soluble in water, turning green 

 with chloride of iron. 



Pill01)icrill = C44 H36 022- In the leaves and bark of Pinus 

 sylvestris and allied species, also in the green parts of Thuja 

 occidentalis and congeneric plants. Draw out with alcohol of 40%, 

 distil off the alcohol, mix the remnant with water, pour off from 

 the subsiding resinous mass, mix the liqxiid with a few drops of a 

 solution of acetate of lead, filter, precipitate from the filtrate the 

 oxy-pinotannic acid with acetate of lead, and after removing the 

 deposit throw down the pinotannic acid Avith sub-acetate of lead 

 boiling hot, filter, treat the filtrate with sulphuret of hydrogen, 

 evaporate the liquid, freed from the sulpliide of lead, in a current 

 of carbonic acid gas to honey consistence, and shake Avith anliy- 

 drous ether-alcohol, which dissolves the Pinopicrin and leaves the 

 sugar. Pi-eciijitate from the solution a small quantity of foreign 



