Chemistry and Physics. 139 
6. On Saccharin and Saccharinie Acid.—ScuEtsiER has ex- 
mined carefully the new glucose derivative discovered by 
Peli ot and called saccharin, to which he assigned the formula 
or its preparation dextrose or levulose or a mixture 
of both’ may be used. The best material is the solid starch- 
sugar of commerce, A kilogram was dissolved in 7 or 8 liters of 
boiled with freshly wheres calcium carbonate the latter is 
dissolved with evolu and calci 
e 
saccharin and water. To this body saccharin, therefore, ‘Scheibler 
assigns the structural formula 
CH, (OH) —CH(OH)—CH(OH)—CH~—CH,—co 
wo 
The s 
tallieable, except those of potassium and ammonium, Optically, 
saccharin is dextrorotatory, [a]p>= +93°8. But the saccharinates 
are levorotatory, the calcium salt giving [a]>=—5°7 and the 
sodium salt aan Further pg eae are in sa es i 
er. Berl. Chem. Ges., xiii, trons lhe 18 a 
7. On the Synthesis of Tr Acid. _Latensiie Paty Rie 
HEIMER have succeeded in effecting the synthesis of tropic acid. 
By the action of phosphoric chloride Soha ne dichlor- 
ethylbenzene was prepared by the re 
C,H oe +PCl, EM 3 | co, CH ,+ POCI,. 
acid.— B, Ges., xiii, 2041, 
8, perimental Tank upon the nagebers rotutory "Pol 
ization pe Gases—M. Henri Becqueret carefully a his 
apparatus and the means taken to eliminate all causes of erro 
his difficult determinations. A copper tube 0°122™ in Aameier 
and 3-27" in length enclosed the gases and this was made the 
