Chemistry and Physics. 149 



from absolute alcohol gave on analysis the formula C, B H I0 O 5 , 

 which is that also of emodin, obtained from rhubarb root, as 

 Licbennann I, ad -h..\vn. The aeet vl-derivative was prepared, and 

 found to be acetyl-emodin. The hydrocarbon obtained by distill- 

 ing it with zinc dust, was a mixture of anthracene with'methyl- 

 anthraccne, as its oxidation products showed. A close compar- 

 ison proved The substance to be identical with emodin. The bark 

 contains only about 02 per cent of it. Whether frangulinic acid 

 also actually exists in the bark, the authors promise further inves- 

 tigation to determine.— Per. Berl. Chem. Ges., ix, 1775, Dec. 

 1876. G. F. B. 



7. On the Pht.Aalei.ns of tertiary <,rn,„ntic Poses.— The remark- 

 able anah _, between di'methvlaniliue and phenol, shown in the 

 1 i dm ti , li , 1 h- irom the t rm r \>\ in iction 

 similar to the synthesis by Kolbe of salicylic acid from the latter; 

 has led Fischer to follow up this analogy and to produce a 

 phthaiein of dimethylaniline cones , 'he phtha- 

 lein of phenol, one of liaever's remarkable bodies. This re- 

 semblance is clearly shown in the following formulas of these 



,ro.r, FT OH ^-CO.C 6 H 4 N(CH 3 ) 2 



^CO.C 6 H 4 N(CH 3 ) 2 



The new phthaiein was obtained by the action of dimethylaniline 

 ipon phthalic chloride. The mixture heat-, foams violently, and 

 >ecomes dark-green in color. Water is added, the excess of 

 limethylaniline is removed by evaporation, and there is left a 

 esinous mass which • gives greenish- 



rplUw .^^es. i t f orms mono- and di-chlorides, chloro-platinates 

 ,, the former of which are green, the latter yellow. 

 a colorless base, like the phtha- 

 - X 1753, Dec. 1876. 



8. Standard Meter.— M. G. Matthky presented to the French 

 Acad, my at their meeting of Dec. 4th the platinum-indium 4- 



The metals were pre. ,;, -Claire Deville and 



Debray, and each time 450 ounces of platinum and 55 (50?) ounces 

 n were used. Five ingots thus prepared were cut in 

 small piece,. l, v :l hydraulic press. The fragments were then 

 melted in the "same furnace and kept in a liquid state for a long 

 timebyarlun. ot \ _, u nd burning gas. The new ; 



i. dV The faces of the hammer and am il were 

 °i' polished steel constantly rubbed. The sin 

 scraped were again melted" in a m - - produced 



a very homogeneous mass free from cracks or roughness on the 

 bottom, sides or top. - a bar was obtained 



35 cms. long 7-5 cms wide and J'ociik 

 15-105 kgs. jravity of 21-522. A third of the 



