218 



acid, filter, precipitate the filtrate with siibacetate of lead, decom- 

 pose the deposit under water with sulphiiret of hydrogen, heat the 

 whole mixture, filter hot and evaporate in a current of carbonic 

 acid gas and in a vacuum. Dissolve the crystals which have formed 

 in boiling water iinder addition of alcohol, and recrystallise. — 

 Forms glossy, citron-yellow, microsco[)ic, tabular crystals of 

 asti'ingent taste; is decomposed by heat, insoluble in water, readily 

 soluble in alcohol, separates by diluted acids into sugar and thujetin 

 (Cos Hi4 Oiö), dissolves in alkalies under decomposition, colours 

 chloride of ii'on dark-green. 



Tlllljog'eiliu = Cog Hi2 O14. Known to occur in small quantity 

 in the green parts of Thuja occidentalis, is also obtained on 

 warming thujin with hydrochloric acid. Boil with alcohol, strain, 

 let cool, separate from the wax, distil the alcohol from the filtrate, 

 and mix the remnant with water, and with a few dro])s of dissolved 

 acetate of lead, in order to facilitate filtering. Precipitate the 

 filtrate completely with acetate of lead and reserve the yellow 

 deposit, containing thujin and thujetin (Cos H^ Oie) for the pre- 

 pai-ation of these substances. The filtered liquid produces with 

 subacetate of lead another deposit, containing the Thujogenin; 

 divide in watei', decompose with sulphiiret of hydrogen, heat the 

 liquid with the sulphide of lead, filter hot, and evaporate in a 

 current of carbonic acid gas and in a vacuum, when the Th. will 

 form in flocks. — Microscopic needles, very sparingly soluble in 

 water, readily in alcohol ; the lattei- solution assuming a splendid 

 green-blue colour with ammonia. 



TIiyilieil:=C2o Hic>. Forms with cymen the more volatile jiart 

 of the oil of thyme. Rectify repeatedly with caustic potash the 

 portion of the raw oil which distils between 1 60° and 1 G5°, and distil 

 afterwards by itself, when the Thymen will pass over at 160° to 165° 

 and the cymen at 17.'i°. — It is colourless, of a pleasaiit odour of 

 thyme, of 0-868 density. 



Tliyill()l = Coo Hi4 O 2 . The solid ingredient of oil of thyme, also 

 contained in the volatile oil of Monarda jjunctata and of the seeds 

 of Carum Ajowan. Distil the oil of thyme by itself, when thymen 

 and cymen pass over first and afterwards Thymol ; press the latter, 

 after it has solidified, and recrystallise from alcohol. — Thin, rhom- 

 boidal, tabular crystals of a pungent, aromatic taste, neutral, fusing 

 at 44° to 50°, boiling at 220° to 230°, of a density^ 1-028 when 

 solid, in the liquid state lighter than water. 



Tobaec'Ocaiiii)lioi'=:NicoTiANiN, 



Toleil = C20 Hk;. In the balsam of Tolu. The oil, obtained 

 from the latter by distillation with water, is a mixture of cinna- 

 mein (according to Flueckiger and Hanbury, it contains no 

 cinnamein), cinnamic acid and Tolen; the latter distils, on heating 

 the oil for a rather long time, to 160°, and is obtained pure by 



