ACETONE.--A solvent for resins, gums, camphor, gun cotton, and other cellulose products. Prepared by distilling barium or calcium acetate in iron stills, the acetate being obtained from the crude acetic acid produced by the dry distillation of wood. _Acid Cellulose._--(See Hydral-Cellulose.) _Adipo-Cellulose._--A distinct compound cellulose present in the complex cuticular tissue of plants, and separated easily by suitable solvents from the wax and oily constituents also present. ALKALI CELLULOSE.--When cotton pulp is intimately mixed with strong caustic soda solution, this compound is formed. It is utilised in the manufacture of _Viscose_. _Amyloid._--Strong sulphuric acid acts upon cellulose and converts it into a gelatinous semi-transparent substance to which the name amyloid has been given. (See Parchment Paper.) BALLISTITE.--A smokeless powder composed of nearly equal parts of nitro-glycerine and nitrated cellulose, with a small quantity of diphenylamine. _Carbohydrate._--A large number of important commercial products, such as cellulose, sugars, starches, and gums, consist of the elements carbon, hydrogen, and oxygen, associated in varying proportions. The ratio of hydrogen to oxygen in these compounds is always 2:1 (H_{2} and O). Cellulose C_{6}H_{10}O_{5}. Sugar C_{6}H_{12}O_{6}. Dextrin _n_ (C_{6}H_{10}O_{5}). To all these substances the term carbohydrate is applied. _Celloxin_ (Tollens).--A substance having the stated composition C_{8}H_{6}O_{6} considered to be present in oxidised derivatives of cellulose. CELLULOID.--This well-known material is made by incorporating camphor with nitro-cellulose, a plastic ivory-like substance being produced. In practice the process is as follows:--Wood pulp or wood pulp paper is saturated with a mixture of sulphuric acid (five parts) and nitric acid (two parts), which produces nitrated cellulose. The product is washed, ground, and mixed with camphor, the mastication being effected by heavy iron rollers. The mass thickens and can be removed in the form of thick sheets. These sheets are submitted to great pressure between steam-heated plates. The cake obtained is cut into sheets of any desired thickness, seasoned by prolonged storage, and afterwards worked up into boxes, combs, brush-backs, and many other domestic articles of a useful and ornamental character.