Chemistry and Physics. 483 
and a last fraction of the sulphate was acres which had erys- 
tallized from an acid solution. The values obtained were 24° 38, 
24°35, 24°39,'24°37, 24°35, 24°37, 24° 41, 24: "31, 24°37, 24°37, 24° 36, 
24° 38, and 24° a7; excluding the seventh as erroneous from the 
presence of a trace of calcium, the mean of the above values is 
24°37 for magnesium.— Ann. Chem. Phys., Vig 289, aap pai 
2. On a new Se <8 Fee Carbamate. —The. bates 
,H,,NO,, obtained by H r by the action of cyanogen on 
sodium-bor neol, was baer ed £6 split up under the action of alco 
holic gine into potassium peer water and borneol. The 
body C,,H,,NO,, obtained by Arru by acting similarly on men 
thol spits ‘in the same way. As these bodies have the composi: 
ae and properties of carbamic ethers, the latter chemist under- 
ok an examination to ascertain whether this behavior was 
Sacra of the class of urethanes. On submitting ethyl 
sky lve to the action of boiling cat ay potash in a flask with 
nh upward condenser for hal ul e liquid contained 
abundant hard brilliant Genta of potassium cyanate. Th 
urea. Hence the rab reaction is general.— Bull. Soc. Chim. 
II, ane 334, stan. 18 G. F. 
‘On. ‘the synt pis esis of a Glucoside of Tart aci a 
a ARD ‘Be succeeded in effecting the synthesis of a ee of 
tartaric acid, by projecting the anhydrous tartaric acid of Fremy 
into melted ‘glucose until the mixture becomes pasty and less 
fusible. An abundant evolution of aqueous vapor is observed 
minutes with a dilute acid, glucose pe tartaric acid result.— 
we. ee Bagel UH, xli, 291, March, 18 
On e Physical Isomerism 0 Cienginkseediaken — The 
ae obtained by Hatter ets the action of cyanogen on 
lc aan and which has been shown by Arth above 
to mphol-urethane, rotates the polarized beam to the right 
and aryetalliec in ieiciedeat crystals. Haller has now prepare 
this urethane from left-camphol obtained from the borneol of 
Ngai. Its aqueous rere on cooling deposited Boa of left- 
' camphol-urethane i in fine needles Pal at 126°-127°. e solu- 
tion rotates the polarized beam to the left aD= 2 ‘ e 
crystals while hemihedral like those of a gisampha ~aretha ane, 
are so in an inverse sense. In the right-handed variety certain 
op exist onl on one side of the erystal while they are absent 
on the other me om left- ee variety these planes are present 
but in a n opposit se, hers n the oats ie instead of the ae 
- observed in the Eat and left gain, ee tee tartrates. _ 
borneol carbonate formed simultaneously with the urethane is — 
