112 ETHYLENE SEKIES. 



8. Methylamylketone, C 7 H 14 = CH 3 .CO.C 5 H n . By 

 the oxidation of the mixture of alcohols obtained 

 from the heptyl hydrides of petroleum. Boiling point, 

 150-152. 



9. Methylhexylketone, C 8 H 16 = CH 3 .CO.C 6 H 13 . By 

 the oxidation of secondary octyl alcohol ; and by the 

 distillation of a mixture of calcium oenanthylate and 

 acetate. Boiling point, 171; specific gravity, 0.818. 



10. Methylnonylketone, C n H 22 = CH 3 .CO.C 9 H 19 . 

 Forms the principal constituent of oil of rue (from 

 Euta graveolens)-, and is produced by the distillation 

 of a mixture of calcium caprate and acetate. Colorless 

 liquid, with a peculiar, bluish fluorescence. Boiling 

 point, 225-226 ; specific gravity, 0.8268 ; congeals at 

 -f 6, forming a laminated crystal In :e mass, which fuses 

 again at 15. 



SECOND GROUP. 

 A. HYDROCARBONS, C n ll 2n (ETHYLENE SERIES). 



The hydrocarbons of this series differ from those of 

 the marsh gas series in containing two hydrogen atoms 

 less. They may be considered as non-saturated com 

 pounds ; it is, however, more probable that two of the 

 carbon atoms contained in them are united by means 

 of so-called double-union. A characteristic property 

 of these hydrocarbons is that of combining directly with 

 two monovalent atoms (Cl 2 , Br 2 , 1 2 , HI, etc.), and thus 

 yielding Compounds which may be looked upon as 

 substitution-products of the hydrocarbons of the marsh 

 gas series, and are either identical or isomeric with 

 the products obtained from the latter. 



The first member of this series CH 2 is not known, 

 and is apparently not capable of existence. 



