54 Scientific Intelligence. 
conditions of its formation. To prepare it 300 grams of dry gly- 
cerin were heated to 190° with 45 grams calcium chloride ina 
balloon of 900 c.c. capacity, until it frothed nearly over. The 
distillate, freed from the more volatile matters, was agitated with 
ether, which was removed and evaporated. It left about 22 grams of 
a product boiling between 150° and 240°, e glycerin was again 
treated in the same way, so that finally i it yielded about + its weight 
of a product boiling ea batee 160° and 210°. Thi 
with potassium hydrat e solution to remove the phenol, and recti- 
fied. Pure glyceryl ether was thus obtained boiling between 171° 
and 173°. ‘Treated in this way 14°8 kilos. of glycerin yielded 250 
grams 0 
ceryl ether (C,H,),O,, is an oily a8 miscible with water, alco- 
hol and ether. Specitic gravity at 16°1s 1°16. On boiling its sr cen 
solution, it changes to glycerin. Veeatin ent with bromine con- 
verts it into dibromhydrin. Solid potassium hydrate nets on it to 
produce phenol.— Bull, Soc. Ch., U1, xxiii, 310, April, 1 
ane 
the fhe dees of Salicylic Acid.—The commercial im- 
decomposition, alone, this method is impracticable ; but RauTERT 
has succeeded in subliming it completely in a current of super- 
eated steam, and ie this way readily obtaining it pure. Recrys- 
tallization from hot distilled water gave the salicylic acid in 
beautiful snow-white crystals.— Ber. Berl. Chem. Ges., ee ~ 
April, 1875 
: On a New Method of Testing Quinidine Sulphate. arene 
proposes a new method of testing quinidine sulphate, founded 
upon the action of ammonia and water upon its iodhydrate, as 
compared with the iodhydrates of quinine, cinchonine and cincho- 
nidine. Half a gram of = — to be tested is warmed to 
60° C. with ten cubic cen of water, ngs a al gee of potas- 
sium iodide is added, nee aed, allowed to cool and after an 
hour, filtere If the pecimen was pure, the f one remains 
clear upon the addition of a d m gevetplseke 
less delicate test, but one commercially satisfactory, is as follows: 
Half a gram of the singe shapah is cf eee at 60° _— pee min- 
utes with 40 c.c. of water, and t mixed with g o 
tassio-sodium tartrate (Rochelle salt). If the sicseuinets ooetsian 
Car ke little or no quinine or cinchonidine, the solution remains ¢€ ~ 
if not, she Fen slat appears, when the ‘admixture amounts to s 
per ¢ This precipitate, after standing an hour, is filtered off, 
waked got a little cold thro and = filtrate after warming is 
mixed with half a gram of potassium iodide. If quinidine be 
present, a precipitate of quistiiee <odbpdsate is produc In 
