Salts of Uvic Acid. — Nicotin. 19 



crystallized state it contains two atoms of water; only one can 

 be driven out by heat, the other is basic. The neutral salts 

 of the alkalies are easily soluble and crystalline, form acid 

 salts, but the fixed alkalies do not form together double salts. 

 The salts of the alkaline earths are difficultly soluble, form 

 no double salts, but this is found to be the case with those 

 salts of the magnesian series which contain halhydrate water. 



Ammonia salt ... Uv + N 2 H 8 O. _ 



Acid salt Uv. N 2 H 8 + Uv. H 2 O. 



Potassa salt UvKO-f-2aq. ("Compounds similar to 



Acidsalt £K<HU*.H'0,J aTffS&Ett 



Soda salt Uv Na O. L the French may be ob- 



Acid salt UvNa O + Uv H 2 0+2aq. tained - 



Uvate soda "] 



+ ^UvNaO + Uv.N 2 H 8 + 2aq. 



Uvate ammonia J 



Baryta salt U v Ba O + 2 } aq. 



Strontia salt ... UvSrO + 4aq. 



Lime salt UvCaO + 4aq. 



Magnesia salt ... Uv Mg O + 5 aq. 

 Manganese salt Uv Mn O + aq. 



Nickel salt UvNiO + 5aq. 



Copper salt UvCuO + 2aq. 



&c. &c. &c. — {Ann. der Chan, und Pharm., vol. xli.) 



Nicotin. 



Ortigosa gives the following statements with regard to 

 nicotin. It is colourless, transparent, smells disagreeably of 

 tobacco, distils perfectly at 100° C, and generally leaves a 

 resin behind which is soluble in alcohol. With a small quan- 

 tity of water it gives a clear solution, which is rendered opake 

 by the addition of more water. Soluble in alcohol and aether, 

 the solutions react alkaline. 



Its neutral solution in hydrochloric acid gives a crystal- 

 line precipitate with bichloride of platinum. Formula C 10 

 H 18 N 2 CI 6 ' Ft, consequently pure nicotin is C 10 H 16 N 2 . 

 Nicotin also combines with chloride of mercury ; the com- 

 pound is formed by mixing the solutions. The white cry- 

 stalline precipitate is insoluble in water and aether, difficultly 

 in alcohol, melts under 100° C, and becomes yellowish. Com- 

 position C 10 H 16 N 2 + Hg CI 2 .— {Ann. Chcm. u. Pharm., xli.) 

 On a new Acid of Sulphur. 



Langlois some time since published a method for obtaining 

 hyposulphurous acid. He prepared the potassa salt by digest- 



C2 



