Pat ae Gee ae ee eee 
Chemistry and Physics. 405 
sium which is not affected by dextrin, 100¢.c. contained 0°102 gram. 
ence a mixture of nine-tenths dextrose and one-tenth dextrin was 
formed from the starch. The solution, in a tube 200 mm. lon 
ferment, in the i of vegetable growth.— Bull. Soe. se 
i “a 10, Jan 
On the pene at pe of Aromatic Compounds, ~The 
stein method of representing aromatic isomers is either graphic, 
by the 8 i the letters . , or o, standing for para, meta or 
rtho, sing figures to represent the positions. Thus the 
Bbiotats os the pf tert Cc a ,-lBrI may be represented by 
Empirical. Symmetrical. Unsymmetrical. Neighboring. 
C,H,Cl, C,H,C1H,Cl C,H,ClIHC1 C.H,Cl1,H 
C,H,Cl, C,HCIHCIHCl] C,H,CIHC]  C,H,Cl.H 
CHCl, CHCl we C.HOIHC],  C.HCIH 
So if the positions 1, 2, 8, see benzene ring be filled by chlo- 
rine, bromine, iodine a pe rogen, the formulas will be 
C,H,ClBr I, ‘BrClHL,c, H ‘TcuBr, C,H,BrIHCl, —— 
C oH, BrCllH, etc. In the first of these formulas the Cl is symm 
rical with the I, is in the neighboring position seers the Br, while 
the Br and I are 0 situated. So th e naphthalene 
derivative which has I in the ope 4 and Cl in 6, may be writ- 
ten C,HCIH (C, TH.) or C, u ,ClH(C,H,I).— Ber. Berl. — sm 
xii, 161, Feb., 
n the ‘Phihalein of Orthoeresol.—FRAUvDE has sicandeast the 
production of Baeyer’s phthaleins by producing the phthalein of 
CO---CH,} HT, 
orthocresol C,H, on HH” For this purpose two parts 
CO-.--C,H, 
cresol, three of phthalic oxide a two pee of stannic chloride 
were heated together to 120° for 8 to 10 hou The cresol un- 
on was removed by a current of s cgierhs eated steam, the 
Mass was dissolved in solution of soda, and precipitated by hydro- 
chloric acid, this process being repeated once or twice. Solution 
in alcohol, * desblorixasion with bone black, and dilution with 
