Chemistry and Physics. 317 
the other and heating, 250 ¢. ¢ 0 , were collected in two 
hours. Hence the discrepancy in the analyses arises from absorbed 
h d gen, an 
diminishes as the operation continues. Making allowance for this 
excess, no simple relation appears between the two oxides of car- 
bon. The 
be in contact with an excess of steam, a reduction of the steam 
takes place. CO+H,O=CO,+H,. In practice, probably all 
2 2 
three of these reactions go on simultaneously, the relative quanti- 
fod 
gaseous constituents.—Liebig’s Ann., excii, 288, June, 1878. 
reduction was effected as in the case of abietic acid, the vapors 
being sag over ignited zinc dust. From 800 grams of the 
ce. of 
oth para 
and meta-ethylmethylbenzene were present in this latter fraction. 
Portion B afforded’ after treatm 
of naphthalene, and a specific gravity near that of water. Analy- 
Sis and its oxidation products fixed it as ethylnapthalene. Hence 
toluene, meta-ethylmethylbenzene, para-ethylmethylbenzene, and 
ethyl-naphthalene are the products of the reduction of gum elemi 
. 
by zine dust.— Ber. Berl. Chem. Ges., xi, 1344, July, 1878. 
. F. B. 
5. On the Constitution of Starch—Muscutus and GRUBE 
have made further experiments in support of the view advanced 
