362
ABSTRACTS
XXXVI1.-Os
:
BULLETIN DE L A
SOCIBTB ( ~ 1 4 1 3 1 1 ~DE; 1 ~ ~PARIS. :
EFFECT OF CHANGE OF DENSITY I N ALUXPERSOLUTIONS O N THE: ABSORPTION BANDS.
THE
PURINE
(Abstract of a I’aper read before the A ~ a ~ i c Ci H x BVICA So Lc i r r s , Sept. 9th,
BY
1860.)
F I E N R Y b [ O R T O N , PII.1).
T h e phenomenon notice? in this paper was the displacement of t h e maxima of absorption in solutions of purpurine ill alum-water. 1st. W i t h changes in amouut of alum. 2d. W i t h ( h n g e s ill temperature. 3d. W i t h change i r i thc alurn salt used, i. e . , ammonia, potash o r soda alum, or siilpliate of alumina. T h e character of these changes was as follows : Greater amount of (‘alum ” in the solution carried t h e maxima downwards in t h e spectrum. A higher temperature likewise had the same effect, as also bad a greater molecular weight in t h e alum salt employed. These results a r e in reinarkable accordance with those noticed by t h e writer in t h e salts of urailiuin.*
Abstracts from American and Foreign Journals. Bulletin de la SociLt: Chimique de Paris Abstractor, E H S BAILEY, PI1 B
On Persdphuric Acid; i t s Formation b,t/ Electrolysis, UER‘rHm,oT (33, 242).-A further study of this acid, discovered in 1 8 i 8 by t h e author. It is formed b y electrolysis b y placing dilute sulphuric acid in a porous vessel, which in turn is surrounded b y another vessel containing the same liquid. The whole is kept cool b y a serpentine coil, throiigL wliicli water flows. Platiriiim electrodes are employed, and a current from (i or 9 Bunsen cells. T h e persulphuric acid is formed a t the positive pole. W a t e r passes through t h e porous cup more rapidly than the acid. A t a later stage of the operation, as t h e acid becomes more concentrated, and liciice presents greater resistance, it seems to be acted upon b y t h e electric current, forming hydric peroxide. T h e fact t h a t this latter g r a d w l l y disappears may probably be accountetl for by t h e well-known action of concentrated sulphuric acid upon it. ____
* See C%emirai N e w , 28, 47, 113, 164, 233, 244, 257, 268
