ORCIN  , a dioxytoluene, C6H3(See also:

• CH3

CH3)(OH)2 (i : 3 : 5), found in many See also:

• LICHENS

lichens, e.g . Rocella tinctoria, Lecanora, and formed by fusing See also:

• EXTRACT (from Lat. extrahere, to draw out)

extract of aloes with potash . It may be synthesized from See also:

• TOLUENE, or METHYLBENZENE

toluene; more interesting is its See also:

• PRODUCTION (Lat. productionem, from producere, to pro-duce)

production when See also:

• ACETONE, or DIMETHYL KETONE

acetone dicarboxylic ester is condensed with the aid of See also:

• SODIUM [symbol Na, from Lat. natrium; atomic weight 23.00 (0=16)]

sodium . It crystallizes in colourless prisms with one See also:

• MOLECULE (from mod. Lat. molecula, the diminutive of moles, a mass)

molecule of See also:

• WATER

water, which redden on exposure . Ferric chloride gives a bluish-See also:

• VIOLET

violet coloration with the aqueous See also:

• SOLUTION (from Lat. solvere, to loosen, dissolve)

solution . Unlike See also:

• RESORCIN (meta-dioxybenzene), C5H4(OH)2i one of the dihydric phenols. It is obtained on fusing many resins (galbanum, asafoetida, &c.)

resorcin it does not give a See also:

• FLUORESCEIN

fluorescein with See also:

• PHTHALIC

phthalic anhydride . Oxidation of the ammoniacal solution gives orcein, C23H24N2O7, the See also:

• CHIEF (from Fr. chef, head, Lat. caput)

chief constituent of the natural dye See also:

• ARCHIL (a corruption of " orchil," Ital. oricello, the origin of which is unknown)

archil (q.v.) . Homo-pyrocatechinis an isomer (CH3: OH: OH= r : 3 : 4), found as its methyl See also:

• ETHER, (C2H5)2O

ether (creosol) in See also:

• BEECH

beech-See also:

• WOOD, ANTHONY A2 (1632-1695)
• WOOD, JOHN GEORGE (1827—1889)
• WOOD, MRS HENRY [ELLEN] (1814—1887)
• WOOD, SEARLES VALENTINE (1798—188o)

wood See also:

• TAR

tar .