260 Scientific Intelligence. 
rid of sodium are to be added, and a sufficient quantity of water to cover 
the mixture. The retort is to be connected with an empty receiver, 
and this by a tube bent twice at right angles, with a flask containing 
distilled water and cooled externally. Sulphuric acid is to be introduced 
into the retort, in small portions at a time, through a Welter’s safety 
tube, and the retort very slowly heated. The distillation goes on quietly, 
and there is but moderate oaming when the proper quantity of water is 
used : the boiling is to be continued as long as a portion of the distillate, 
tested with sulphuretted hydrogen, gives a yellow precipitate. It is 
as of gas. When the distillation - over, the distillate is to be 
th determine the arsenic qulanthaiveha: os as arsenate of ammonia and 
i i in’ th rt contai 
[The method here given appears to deserve attention, but it must be 
borne in mind that antimony would probably be volatilized in the same 
manner as arsenic under the circumstances, The process would admit 
of ready verification by a repetition of the whole distillation, in a fresh 
apparatus, with the chemical Hulierinds used in the previous investiga- 
tion, but without the substance to be tested for the presence of arsenic. 
_ — weit /XXXV, 43 
orangite is identical with thorite, and, consequently, donarium with 
thorium. Bergemann has, however, continued his researches, an 
while expressing himself with due caution, is os prepared to admit the 
conclusions of the French and Swedish chemists, so that — doubt 
may still be entertained upon the subject.—Pogg. Ann., |xx v, 555. 
onversion of Sulphates into Chlorids.—Rose has pa that the 
alkaline sulphates are wero into — by repeated ignition with 
chlorid of ammonium. is method can — r, be employe 
when the sulphates of stile oi or magnesia aes pres as dee salts 
are not decomposed by sal-ammoniac. ¢.— Berliner ‘Moacudaribhie Feb- 
ruary, 1852. 
4. Anhydrous Organic Acids.—Grruarnt has succeeded in isolating 
acetic and benzoic acids, CaHsOs and C14HsOs, and in pointing out 
a method by which many other bodies of a similar nature may oub 
less be obtained. When an equivalent of dry benzoate of soda is oie 
fully heated in a sand bath, with an equivalent of oxychlorid of benzoyl 
a reaction takes place whisk’! is expressed by the equation 
CisHsOs, NaO+C 14HsO2Cl—NaCl42Ci4Hs0s. 
The mass in the retort, washed with water and carbonate of soda, 
leaves a white s cehnas crystallizing in beautiful oblique prisms | fusing 
at 33 C., entirely neutral and volatile without decomposition. This sub- 
stance is the anhydrous benzoic acid, C1 4HsOs, which boiling water 
gradually transforms into o rdivary benzoic acid, ogee 
aes ee ee ee eee ea Heated with 
