138 



in ether. — White, wart-shaped mass, of a very rancid taste, fuses 

 at 35°, and remains then in the amorphous state; has an acid 

 reaction; dissolves little in water, readily in alcohol and in ether, 

 also in alkalies, and reprecipitable by acids; is not volatile. 



[]Vataloin=:C34 H19 O15. Crystallised bitter substance, dis- 

 covered by Flueckiger from Natal-aloes. By triturating the 

 drogue with an equal weight or less of alcohol at 49° or below, the 

 Nataloin is left behind in pale-yellow crystals. — The Nataloin 

 dissolves at 15-5° in 70 parts common alcohol, in 60 parts of a 

 mixture of 1 ether and 3 alcohol, in 35 parts methyl-alcohol, in 50 

 parts acetic ether, in 1236 parts ether, and in 230 parts absolute 

 alcohol. It is of a pure bitter taste, gives out no water at 100°, 

 fuses at 180° to 189°. It dissolves in concentrated sulphuric 

 acid, the solution becoming beautifully green on the addition of 

 niti-e or chlorate of potash. Nitric acid yields vnth Nataloin oxalic 

 acid ; alkaline liquids dissolve Nataloin under darkening. The three 

 varieties of aloin, obtained respectively from Barbadoes, Natal, and 

 Zanzibar, are named by Flueckiger Barbaloin (Aloin), Nataloin, 

 and Socalein. They are distinguished, according to Histed, by the 

 following reactions: — A drop of nitric acid gives, with a few 

 l)articles of Barbaloin or Nataloin (not with Socalein), a vivid 

 crimson. Nataloin (not Barbaloin or Socalein), assumes a fine blue 

 colour by adding a minute quantity to a drop or two of concen- 

 trated sulphuric acid, then allowing the vapour of a rod touched 

 with nitric acid to pass over the surface.] 



[]Vg'ai-caillI)llor=C2o His Oo. Obtained from Blumeabalsamifera. 

 White crystals, precisely like Borneo-camphor, which they also 

 resemble in odour and hardness, as well as in being a little heavier 

 than water, and not so volatile as camphor. The alcoholic solution 

 rotates to the left as powerfully as Borneo-camphor to the right. 

 Boiling nitric acid converts Ngai-camphor into a laevogyric cam- 

 phor rzCao Hi6 Oo, identical with the camphor of Chrysanthemum 

 Pai'thenium, and distinguished from common camphor only by the 

 critical properties. — Plowman.] 



]ViCOtiaililI=:C4o Hs^ N2 Oo. Separates on the surface of the 

 aqueous distillate of tobacco. — White laminae, smelling like tobacco 

 smoke, have not an acrid, but a warm and bitter aromatic taste; 

 soluble in water, alcohol, and ether, also in potash-ley, the latter 

 solution yielding nicotin by distillation. 



Mcotin = Cio II7 N. Volatile alkaloid of Nicotiana species. Draw 

 out the connninuted tobacco-leaves with hot water, containing 

 1°/q sulphuric acid, strain, press, concentrate the liquid to syrup 

 thickness, add one-twentieth of the weight of the leaves pulverised 

 charcoal, evaporate to dryness, 2>nlverise, treat warm with alcohol 

 of 90°/q, allow to cool, filter, drive ofi" the alcohol, add water, filter 



