( 160 ) 
place at 160°, the addition of sodium nitrate depresses this tem- 
perature. 
The limiting mixed crystal of the series which is rich in silver 
undergoes the change at 138°. 
Below 138° only rhombic crystals, containing much silver, and 
rhombohedral crystals, containing much sodium, are capable of 
existence. 
No transformation has been observed in the latter down to — 50°. 
The limits of composition of the two kinds of erystals become 
more and more restricted as the temperature falls below 138°, so 
that at 15° they are 0—1,6/, (in molecules) NaNO; and 64.4— 
100 °/, Na NO3. 
The compositions of the coexisting limiting crystals were determined 
by allowing them to deposit beside each other from suitable solutions. 
The transformation of the rhombohedral into rhombic crystals on 
the lines FH and FG was determined by means of an air dilatometer. 
Chemistry. — By Prof. H. W. Bakuuts Roozesoom: * The Nature 
of inactive Carvoxime.” 
In continuation of the investigations of Mr. ADRIANI on the 
phenomena of fusion and solidification of mixtures of optical anti- 
podes, carvoxime has been examined. Samples of the d- and /-oximes 
were prepared for us through the kindness of Prof. GOLDSCHMIDT 
of Heidelberg. 
Up to the present time the inactive carvoxime has been regarded 
as a racemic compound. This view rested on the facts that the 
melting point is higher than that of the active substances and that 
the density is greater (1.126 against 1.108). 
The investigation of the melting and solidifying points gave the 
following results. 
Composition of the | Commence- End of 
ment of 
fused mass. solidification. | solidification. 
1009/, d of Z 12° 72° 
99 vy 712°4 -— 
98 y 73°0 — 
95 / " 1594 1e 
90 wv y 79°0 159 
80 / 8406 80° 
15 Wy 86°4. 820 
70 wv ” 882 850 
60 # y 90°4 “= 
Ap 7 | 91°4 | 91°.4 
