194 Notice of some Recent [March 



is formed in a solution of nitrate of mercury, by crenicacid, 

 or its soluble salts. 



4 



Cremate of Silver is formed by dropping crenic acid into a 

 solution of nitrate of silver. It is a grayish white matter, 

 becoming purplish after some time. The water of Porla 

 becomes red by the addition of nitrate of silver, which is 

 obviously owing to the re-action of the crenic acid. 



The alkaline apocrenates can be best formed by pouring 

 apocrenic acid into the solution of an alkaline acetate, and 

 extracting the alkaline acetate remaining, after evaporation, 

 with alcohol. The matter produced forms a blackish mass, 

 which gives a brown tinge to its solution in water. 



The ammoniacal salt becomes acid by evaporation, dissolves 

 readily again in water, and reddens litmus paper ; 100 parts 

 of dried apocrenic acid, at 212° F, give, after solution in 

 ammonia, and evaporation in the water bath, 113*22 parts. 

 Considering this to contain an atom of water and one of ° 

 ammonia, and to constitute a biapocrenate of ammonia, the 

 numbers, according to the previously ascertained atomic 

 weight, would be 112-98. 



The earthy apocrenates are dark-brown precipitates, 

 which, by washing, form a yellow solution. If the solution 

 is evaporated a brown residue remains, which is again 

 soluble in water. With excess of base an insoluble salt is 

 formed. 



When apocrenic acid is added to the hydrate of alumina 

 in excess, the acid will be precipitated. With a small por- 

 tion of hydrate, apocrenate of alumina is obtained in solution. 

 When an alkaline apocrenate is digested with the hydrate, 

 it is so completely precipitated that the solution loses its 

 colour, and contains only a trace of crenic acid. 



The precipitate is brownish black, and is a double salt. # 



Apocrenate of Copper, when precipitated out of an acetic 

 acid solution, with excess of the latter, is acid possessing a 

 brown colour, and having a slimy consistence. It is soluble 

 in small quantity in pure water. By adding to this solution 

 alkali the neutral salt precipitates. It forms double salts 

 with ammonia and soda. 



Apocrenated Protoxide of Iron is soluble in water, but by 



* Whether the atomic weight of apocrenic acid is 16*5 or 16*75, must he 

 determined by future experiments. — Edit. 



