See also:

• CAFFEINE, or THEINE (1.3.7 trimethyl 2 . 6 dioxypurin)

CAFFEINE, or THEINE (1.3.7 trimethyl 2 . 6 dioxypurin)  , C$ His N4 02 . H ? O, a substance found in the leaves and beans of the See also:

• COFFEE (Fr: cafe, Ger. Kaffee)

coffee See also:

• TREE (0. Eng. treo, treow, cf. Dan. tree, Swed. Odd, tree, trd, timber; allied forms are found in Russ. drevo, Gr. opus, oak, and 36pv, spear, Welsh derw, Irish darog, oak, and Skr. dare, wood)
• TREE, SIR HERBERT BEERBOHM (1853- )

tree, in See also:

• TEA (Chinese cha, Amoy dialect t€)

tea, in See also:

• PARAGUAY

Paraguay tea, and in small quantities in See also:

• COCOA

cocoa and in the See also:

• KOLA

kola See also:

• NUT
• NUT (0. Eng. knutu, cf. Dutch noot, Ger. Nuss; allied with Gael. cno; it is not of the same form as Lat. nux)

nut . It may be extracted from tea or coffee by boiling with See also:

• WATER

water, the dissolved See also:

• TANNIN, or TANNIC ACID

tannin precipitated by basic See also:

• LEAD
• LEAD (pronounced iced)

lead acetate, the See also:

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

solution filtered, excess of lead precipitated by sulphuretted See also:

• HYDROGEN [symbol H, atomic weight x-oo8 (0=16)]

hydrogen and the filtered liquid then evaporated to See also:

• CRYSTALLIZATION

crystallization; or, tea is boiled with water, and the whole then evaporated to a See also:

• SYRUP (0. Fr. ysserop, mod. sirop, Span. xarope, for axarope, Arab. al, the, and sharab, drink; cf. Sherbet " and " Shrub ")

syrup, which is mixed with slaked See also:

• LIME
• LIME (O. Eng. lim, Lat. limes, mud, from linere, to smear)

lime, evaporated to dryness on the water-See also:

• BATH
• BATH, THOMAS THYNNE
• BATH, WILLIAM

bath and extracted with See also:

• CHLOROFORM (trichlor-methane), CHC13

chloroform (P . Cazeneuve, See also:

• BULL
• BULL, GEORGE (1634–1710)
• BULL, JOHN (c. 1562–1628)
• BULL, OLE BORNEMANN (18ro-188o)

Bull. de la See also:

• SOC

soc. chim. de See also:

• PARIS
• PARIS (also called ALEXANDROS)
• PARIS, ALEXIS PAULIN (1800-x881)
• PARIS, BRUNO PAULIN GASTON (1839-1903)
• PARIS, FRANCOIS DE (169o-1727)
• PARIS, LOUIS PHILIPPE ALBERT
• PARIS, TREATIES OF (1814-1815)

Paris, 1876-1877, 27, p . 199) . Synthetically it may be prepared by the methylation of See also:

• SILVER

silver theobromine and silver theophyllin or by boiling heteroxanthine with methyl iodide and potash . E . See also:

• FISCHER
• FISCHER, EMIL (1852– )
• FISCHER, ERNST KUNO BERTHOLD (1824–1907)

Fischer and L . Ach (Berichte, 1895, 28, p . 3135) have synthesized it from dimethyl alloxan, whilst W . Traube (Berichte, 1900, 33, p .

3435) has obtained it from 1 . 3 diamethyl 4 . 5 diamino 2.6 dioxypyrimidine . On the constitution of See also:

• CAFFEINE, or THEINE (1.3.7 trimethyl 2 . 6 dioxypurin)

caffeine see BURIN and also E . Fischer (Annalen, 1882, 215, p . 253) . Caffeine crystallizes in See also:

• LONG, GEORGE (1800-1879)
• LONG, JOHN DAVIS (1838– )

long silky needles, which are slightly soluble in See also:

• COLD (in O. Eng. cald and ceald, a word coming ultimately from a root cognate with the Lat. gelu, gelidus, and common in the Teutonic languages, which usually have two distinct forms for the substantive and the adjective, cf. Ger. Kolte, kalt, Dutch koude

cold water . It becomes anhydrous at ro0° C. and melts at 234° to 23 5° C . It has a faint See also:

• BITTER, KARL THEODORE FRANCIS (1867– )

bitter See also:

• TASTE (from Lat. taxare, to touch sharply; tangere, to touch)

taste and gives salts with See also:

• MINERAL

mineral acids . On oxidation with nitric See also:

• ACID (from the Lat. root ac-, sharp; acere, to be sour)

acid caffeine gives cholesterophane (dimethyl parabanic acid), but if See also:

• CHLORINE (symbol Cl, atomic weight 35`46 (0=16)

chlorine water be used as the oxidant, then it yields monomethyl See also:

• UREA, or CARBAMIDE, CO(NH2)2

urea and dimethyl alloxan (E . Fischer) .