EXAMINATION OF A NAPHTHA FROM LIME-SOAP. 205 
Formuna. | OBSERVED BOILING POINT. \| FORMULA. OBSERVED BOILING POINT. | 
Cig He 79.9° Cig Hig 153° | 
C14 He 111.° Ceo Heo 1749-175° 
Cis Hio C22 Hae 195.4 
Cig Hie Cos Hos 212.601 
It will be noticed that the observed boiling points of all these bodies go to corroborate 
the results previously published by one of us.” A difference of 30° C. for the addition 
of C,H, being the rule in each of the series,— with the single exception of the 
higher C,H, series, in which the difference is only 20°, as has been previously 
stated. See pp. 168, 176 of the memoir cited. It will be noticed, moreover, that in 
this research we have encountered, for the first time in our experience, the lower C, 
H, series (homologues of olefiant gas), and that its members follow the rule of 30°; 
hence the addition of still another series to the list of those known to conform to this 
law. 
It is a curious fact that the two C, H, series unite at 155°. We are still ignorant 
whether the body, “ pelargonene,” which boils at about that temperature, belongs to 
the lower or to the higher series; or whether, as is possible, it does not belong 
to both series. In petroleum we have found it as a member of the higher series. 
Since the two series thus coalesce, or at all events since there is no absolute breach 
between them, it seems to be proper enough to derive the names of the members of 
the higher series in accordance with the rules which have hitherto been employed by 
chemists in designating the members of the lower or olefiant series. In view of the 
greater simplicity of this course, we have preferred to adopt it, rather than to leave 
the substances without names, or to attempt to base a system of nomenclature upon 
the somewhat discordant data concerning diamylene, triamylene, etc. which have 
been published. Further researches are of course called for before the trug, character 
of these new bodies can be definitely determined. 
It would be premature, at this time, to offer any speculations as to the precise man- 
ner in which the hydro-carbons which we have here examined are formed during the 
destructive distillation of the lime-soap. But it is important to bear in mind the facts 
that while in coal-tar naphtha we find members of the benzo leseries, and in coal-oil 
naphtha and petroleum two series of hydrides and the higher series of C, H,, we 
have here in the products of distillation of lime-soap a third naphtha which stands in 
some respects midway between the other two; for it contains both benzole, Schor- 
lemmer’s hydrides, and the higher series of C, H,, though it is at the same time specifi- 
1 Known to be impure. 2 Warren, Memoirs of American Academy (N. 8.), IX. 170. 
