chemical Science. 443 



H resembled the former alcoate, meltin^r by heat, boiling and giving 

 off alcohol. When cautiously decomposed in this manner, the pro- 

 portions of alcohol and salt obtained were as follows : — 

 1 atom nitrate of magnesia, 9.25. 

 9 atoms of alcohol, 25.875. 



Alcoated Nitrate of Lime. — Boiling alcohol, saturated with an- 

 hydrous nitrate of lime, gave a solution, viscid on cooling, which, 

 during a frosty night, was resolved into an amorphous solid, slightly 

 moist, but without any appearance of crystallization. Being dried 

 and analyzed in the usual way, it gave the following products : — 

 2 atoms nitrate of lime, 20.5. 

 5 atoms alcohol . 14.375. 

 In another strong alcoholic solution, a few irregular crystals were 

 deposited, proving the power of this alcoate to crystalHze. 



Alcoated Proto-Chloride of Manganese. — A hot saturated solution 

 of this compound in absolute alcohol readily afforded crystals upon 

 cooling, which were plates with ragged edges. These, collected and 

 decomposed as before, gave the following as their composition : — 

 1 atom proto-chloride of manganese, 8. 

 3 atoms of alcohol 8.625. 



Alcoated Chloride of Zinc. — The solution of chloride of zinc in 

 absolute alcohol may be concentrated to such an extent, that when cold, 

 it is so viscid as not sensibly to flow. It then begins to deposit crystals, 

 which are small and irregular ; such a solution was found to con- 

 tain 20 parts chloride of zinc, and only 7 of alcohol. The crystal- 

 line matter, being dried with difficulty, was of a yellowish colour, and 

 sofl ; by heat it entered into semifusion, and evolved its alcohol. 9 

 grains gave 7.65 of chloride, so that the composition is probably 

 2 atoms chloride of zinc, 17.5. 

 1 atom alcohol . 2.875. 



Besides these compounds, similar combinations of chloride of 

 magnesium and proto-chloride of iron were found. — Trans. Soc. 

 Edinburgh. 



28. New Vegeto- Alkalies. — The list of these bodies is exceedingly 

 fluctuating. The highly interesting nature of a few of them confers 

 great importance on the class, whilst the large number which are 

 unimportant prevents that quick and specific verification of the 

 announcements given to the world from various quarters which is 

 desirable. It is only, therefore, occasionally, that some are struck 

 out of the list, and that a great number remain of doubtful character. 



M. Wackenroder describes one of these substances, which he calls 

 corydalittj in consequence of its having been procured from the 

 tubercles of the Corydalis tuherosis. The tubercles in coarse powder 

 are to be macerated tor several days in water. A deep brown, slightly 

 acid liquid is obtained, which, being precipitated by an excess of 

 sub-carbonate of soda, yields a clear grey precipitate. This digested 

 in alcohol forms a greenish-yellow solution, which, filtered andallowed 

 to stand, produces small crystals of corydalia. The largest part 



