268 Scientific Intelligence. 
AnNaLyTicaL CHEmistry, 
6. On the Behavior of Dextrin and Gum Arabic toward Albumen— 
Rup. Gixsnexe (Sitzungsberichte der Wiener Academie, Mai, 1862) finds 
that mineral acids, added to the turbid mixture of fresh white of egg and 
water, have the same effect as organic acids, if the acid be employed in 
small quantity, viz: the albumen goes into solution more perfectly, in- 
tate is formed which disappears on further addition of gum arabic. 
heating the mixture, snow-white flocks separate. This observation fur- 
nishes a means of distinguishing these two carbo-hydrates, 8. W. J 
tric acid i 
7. Detection of ni in waters by means of Brucin.—KuxstEN 
to be tested and finally 1 c. ¢. of sulphuric acid. The latter is allowed 
to flow down the side of the glass so as to gather beneath the water. 
At the plane of contact of the two liquids a rose-red zone immediately 
forms if the nitric acid be present in detectable quantity. 8. W. J 
8 96. ’ : 
9. Reaction for Molybdenum.—According to Bravx, (Zeitschrift fir 
Analyt. Ch., 1863, 36,) sulpho-cyanid of potassium gives, with certain 
solutions of molybdenum, a red color similar to that produ 
t in solutions of per-salts of iron. The brown, solation of 
Mo,0, in HCl, mixed with concentrated solution of an alkali | 
__* According to Goppelerdder (Verliandl. der naturforsch. Gesells. in Basel. 1861 
180) foming Sihefilatoar wohed bees agente et uit 
co in the Sheffield Laboratory 
ye, Ws, 
