474 Intelltge?tce a7id Miscellaneous Articles. 



purification is eventually completed by repeated crystallizations in 

 alcohol, or in a mixture of alcohol and sether. 



The benzoic acid separated in this manner is added to that which 

 the decanted liquor contains, which is then strained through a cloth 

 and washed with cold water. It is to be carefully pressed ; and by 

 treating it in a capsule with a small quantity of hot water, a fresh 

 and often considerable quantity of the new acid is separated, which 

 had been dissolved during the first separation. 



The pure acid consists of granular crystals of a cauliflower form. 

 When examined by the microscope, they present the form of four- 

 sided acicular prisms. It melts at 302°, and when melted its den- 

 sity is 1-29 ; it boils at 270° F. It volatilizes without decomposing, 

 and is deposited during distillation on the sides of the vessel in flat 

 needles of a greasy lustre and grouped around a common centre. 



Its odour, especially when it has been melted, is sharp and pene- 

 trating, like that of all chlorinated compounds in general, but en- 

 tirely difi^erent from that of the acid from which it is derived. 



Analysis showed that it was composed of— • 



C«4 72 50-00 



H>o 5 3-47 



CP 35 24-30 



O* 32 22-23 



144 100-00 



"When chloroniceic acid is treated with fuming sulphuric acid, they 

 combine so as to form with barytes a soluble salt, probably repre- 

 sented by 2S03, C24 H8 Cl^ O^, BaO, H^ O, like the corresponding 

 sulphobenzoate. 



When distilled with lime or barytes, with proper precautions, two 

 hydrocarburets are formed ; the first is liquid and the second solid. 

 It resists long-continued exposure to the action of dry chlorine, even 

 under the influence of heat, and also the dechlorizing action of the 

 amalgam of potassium. — Ann. de Chim. et de Phys., Avril 1849. 



ON THE NATURE AND COMPOSITION OF VARIOUS CHLORO- 



NICEATES. BY M. E. SAINT-EVRE. 

 Chloroniceate of Ammonia. — When freshly prepared by the direct 

 saturation of [chloro ?] niceic acid dissolved in alcohol, [chloro ?] 

 niceate of ammonia crystallizes in large micaceous laminae, which 

 undergo change by the action of light, becoming brown and acid to 

 litmus-paper. When pure, this salt is fusible and volatile, without 

 undergoing decomposition. By analysis it appeared to be composed 

 of— 



C24 72 44-72 



H'6 8 4-96 



Cl^ 35 21-73 



O* 32 19-90 



Az2 14 8-69 



161 100-00 



