41 



at 40° to di-yness. The remaining Cerealin is similar to albumin, 

 amorphous, nitrogenised, soluble in water, insoluble in alcohol, 

 ether and oils. The aqueous solution curdles at 75°, and at the 

 same time the C. loses its activity. 



Ceropiuic Acid = C36 H34 O 5 . In the bark of Pinus sylvestris. 

 ■Obtained in the same manner as indicated under Pinocorretin, 

 and piirified by recrystallising in ^alcohol with aid of animal 

 charcoal. White powder, consisting of microscopic crystals, fuses 

 at 100° and congeals like wax. 



Cerosin = C48 H50 O 2 • Wax-like sixbstance which forms on 

 the surface of the stalks of the sugar-cane (Saccharum officinarum) 

 and is easily collected by scraping. To purify it, digest first with 

 cold alcohol, dissolve afterwards in boiling alcohol and allow to 

 crystallise. It forms pale-yellow light laminae of mother-of- 

 pearl lustre, without odour and of 0'961 sp. gr., is hard, easily 

 friable, fuses at 82°; insoluble in water and cold alcohol, readily 

 soluble in boiling alcohol and congealing, when cold, to an 

 •opodeldoc-like mass ; insoluble in cold, slowly soluble in hot ether, 

 •combines slowly with alkalies. 



Ceroxyliii or Ceroxylon Resin = C40 H32 2 . It is contained in 



the Palm-wax, obtained by scraping the stem of Ceroxylon Andi- 

 cola and boiling the substance with water. It is obtained pure by 

 boiling the Palm-wax with alcohol, filtering while hot and allowing 

 the liquid to cool. The wax is then removed and the mother-ley 

 ■evaporated to form crystals. The ciystallised resin appears in 

 white, fine needles, melts above 100°, dissolves little in cold, 

 readily in hot alcohol, also in ether and volatile oils. 



Cetraric Acid =030 Hie Oiß. In the Iceland-moss (Cetraria 

 Islandica). Boil with alcohol under addition of carbonate of 

 potash, strain, precipitate the decoction with diluted hydrochloric 

 acid and water, and remove from the deposit foreign matters as 

 lichenostearic acid, thallochlor, &c., by successively treating with 

 boiling alcohol of 42% and ether, mixed with oil of rosemary or 

 camphor. From the remaining grey-white mixtvire of Cetraric acid 

 and an indifierent white compound, the former is dissolved by a 

 -cold aqueous solution of bicax-bonate of potash, and has to be 

 precipitated with hydrochloric acid and reciystallised in the least 

 possible quantity of boiling alcohol. — Snow-white, loose tissue of 

 shining, hair-shaped needles, very bitter, not volatile, loses at 100° 

 nothing of its weight, turns brown at 125° and decomposes; does 

 not dissolve in water, but imparts to it a faint, bitter taste when 

 boiled; is slowly soluble in cold, readily in boiling alcohol, little in 

 ether, not in oils; most readily in the hydrates and carbonates of 

 alkalies; the bright-yellow solutions have a very bitter taste, and 

 are precipitable by acids. 



