' q 
es 
E 
Chemistry and Physics. 425 
phosphorus. Lautemann has succeeded in a more direct transformation 
of lactic acid by the agency of iodid of hydrogen. When concentrated 
lactic acid is diluted with half its volume of water and the cooled liquid 
is saturated with iodohydric acid gas, iodine is set free and if the liquid is 
heated in a closed tube to 140° C, iodine is separated in quantity. 
filtered liquid neutralized with potash and then distilled with dilute sul- 
phuric acid yields propionic acid mixed with some iodine and iodohydrie 
d which are easily separated by carbonate of silver. The reaction 
which yields propionic acid is expressed by the equation 
CeHs(HO2)04+-2HI = CoHoOs-++-2 HOI. 
Propionic acid. 
Lactic acid. acid. 
ours. 
ution on evaporation gives a mixture of sal-ammoniac and alanin 
Which are easily separated. ‘The reaction in this case is expressed by the 
equation— , 
CoHsCl0s, CuHs0-+-2NHs-+-2HO=CoHa(NH2)03, HO--NHsCl+- 
CsHsO, HO. 
Ann. der Chem. u. Pharm., cxiti, 220. 
4. On the Constitution of Lactic Acid—Kowse has communicated a 
-—Ann, der Chem. und Pharm., exiii, 223. 
5 Contributions to the Chemistry of the Platinum-metals.—Cravs has 
Continued his investigations of this most difficult subject and has obtained 
he an and interesting results, the most important of which we shall 
State, ; 
hh the present paper, the author confines his attention chiefly to ruthe- 
sam. and its pales with osmium. The hydrated deutoxyd of ruthe- 
nium has the formula RuO2-+-5HO and may be obtained either by digest- 
ae the corresponding chlorid with carbonate of potash and washing 
«Oxyd with boiling water, or by precipitating the sulphate of the oxyd 
sie da. The sulphate in question may be prep 
b 
Salt or so i. 
4 Done the sulphid with nitric acid. The oxyd when freshly prectpi- 
ND SERIES, Vor. XXIX, No. 87.—MAY, 1960 
7 54 
