204 EXAMINATION OF A NAPHTHA FROM LIME-SOAP. 
decomposition occur, it would be attended with the formation of small quantities of 
bodies boiling at lower temperatures than the substance sought for. It should be 
remarked, however, that this view has been suggested to us, not so much by any obser- 
vations peculiar to ourselves, as by the consideration of the well-known fact that 
paraffine and those portions of petroleum which boil at very high temperatures can be 
broken up by repeated distillation, with formation of much lighter and more volatile 
oils, — a fact which has frequently been acted upon by the manufacturers of coal-oil 
for illuminating purposes, and which, when carried out upon the large scale, is techni- 
cally known as “ cracking ” the paraffine or heavy oil. 
In brief, then, it appears as the result of our examination of the naphtha from lime- 
soap that this mixture contains : — 
Amylene, . : é : : : “ . - Cio Hio 
Hydride of Amyl, . i ‘ ; é ‘ ‘ x Cio Hig 
Caproylene, . : goose OS : . : b » Cre Mig 
Hydride of Caproy], ‘i % ; : : a 5 Ciz His 
Benzole, . ‘ r . . . rn ‘ . Cig He 
nanthylene, ‘ : F § : . , ; Ci4 Hi4 
Hydride of Ginanthyl, . ; ; = é . Crt His 
Toluole, . . 3 ‘ x - 4 2 : e Ci4 He 
Caprylene, . a ; ‘ 4 ‘ ‘ i . Cre His 
Hydride of Capryl, . : : f 5 ‘ : Cig His 
Xylole, ‘4 ‘ ‘ . . ‘i i - Cie Hio 
Pelargonene, . : . 5 . : ¥ . 3 Cig Hig 
Tsocumole, . : . ; 4 2 : 5 ‘ . Cig Hig 
Rutylene, , ' P Z i: , " ¥ C20 Hao 
Margarylene, i 7 j : " . : . Coo Hee 
Laurylene, ‘ : ‘ ' : r - ‘ Cog Hos 
Or, arranged in homologous series : — 
FORMULA. | OBSERVED BOILING Pornt.t | FORMULA. OBSERVED BOILING POINT.1 
Cyo Hin. =. . «|. 84,5°-85.6° Cio Hig. . . «| ~~ « - About 39° 
Cig Hig. . . . «|. About 65° Cig Hig. «w]e es . 68.5°-69,5° 
Ci4 Hig. . . . «|. Something less than 95° Cr Byes cee silo ao « O70 
Cig Hig. . . . «|. 128.89°-125.2° Cig Hig. . . - «| . « . 1289-1299 
Cig Hig . . . «|... « 158° 
1 With regard to these two series we are still uncertain whether or no the true boiling points may not in the one case be a trifle, 
say a fraction of one degree, lower than the degrees the names of which end in five; and in the other case be more nearly 
expressed by the degrees the names of which end in nine than by those which end in eight. These points we hope to elucidate 
thoroughly at some future time. But with regard to the difference in boiling point of almost precisely 30° C. for each addition of 
. C2 Hy, there can be no room for doubt. 
