Chemistry and Physics. 301 



concentration act upon marble, the velocity of evolution of carbon 

 dioxide is inversely proportional to their molecular weights.— 

 Ber. Berl. Chem. Ges., ix, 1 646, x, 34, Jan. 1877. g. f. b. 



2. On the Equivalence of Nitrogen. — Ladexblku and Stkeve 

 have sought to throw some light upon the equivalence of nitrogen 

 by studying carefully and comparing directly the properties of 

 triethylbenzylammonium chloride and iodide on the one hand, 

 and those of benzyltriethylammonium chloride and iodide on the 

 other. The former bodies were prepared directly by acting on 

 triethylamine with bonzvl chloride in a sealed tube at 100°. A 

 white crystalline mass results, which is soluble in water, and is 

 easily crystallized therefrom. The platinum double chloride crys- 

 tallizes easily from hot water, and has the formula (N(C,H 5 ) 3 

 C,H 7 Ul) g PtCl 4 . The iodide, obtained by the action of silver 

 oxide and hydriodic acid on the chloride, when its solution is 

 evaporated on the water bath, i- verv readily decomposed, yield- 

 ing irritating odors of benzyl iodide. The' second bodies were 

 obtained by acting on benzylamine with ethyl iodide at 130°. 

 The platinum double chloride gave the formula (XC 7 H 7 (C 2 H 5 ) 3 

 Cl) 2 PtCl 4 . When, however, aqueous solutions of benzyltriethyl- 

 ammonium iodide are evaporated on the water-bath no benzyl 

 iodide is formed even when the evaporation is carried to dryness. 

 This difference in the behavior of the two bodies leads the authors 

 to regard them as isomeric and not identical. The same conclu- 

 sion is drawn from the form of crystallisation of the platino- 

 chlorides, one being appai *e other ortho- 

 rhombic. From five bonds of nitrogen m 

 ammonium chloi the same value.-- Ber. Bed. 

 Chem. Ges., x, 43, Jan. 1877. G - F - B 



3. Action Of ///,„;,„/ Xltrir ,,rnl Oil Codl <?««.— AkESTO RIDES 



has studied the' pr..du t~ obtained from coal gas bypassing it 

 through fumino- r o layer separated and crys- 



tals began to appear. The heaw layer evolved on heating tor- 

 rents of nitrogen tetroxide gas, and on adding water, a yellow 



■b was nc 1 

 consisted of oxalic acid. The lighter rl 



i Sly of 1 

 »oili ng at 205°, the Mhcr at -'-/. I—in- n in- benzene ami u.iru- 

 toluene. A small .piantitv of a third body, boiling about 300 , 

 was obtained, pr< thafcne. In examining lor 



the source of the author found ^.f 



benzene gave noii !!nr ;l, 2' U f\ 



toluene and xvhi h and thylene afforded it 



abundantly. Hence the '>' t0 Berthelot s 



opinion, that et In 1 ., is m.i ed b uitri. . id and is oxidized 

 to^ oxalic acid; this substance being permanent even in fuming 

 acid.— J m pK Ch u ^ j. Uh is:7 . g. F. B. 



+ /. Oh oxidize./ />/.W„ ■ ■ w,,/,/-/. - K. \- Mkykh has examined 

 tbe so-called oxidi • long known for its spec al 



catalytic activity. It was prepared by precipitating a hot solu- 



