444 Richardson and Mackenzie — Natural Naphtha from the 



n-Hexane boils at 71°,* sp. gr. 0-6630 (17°) £T D 20° 1-3734 ; 

 methylpentamethylenef boils at 71°, sp. gr. 0*7474 (21°/4°), 

 ^sT D 20° 1*4101. This fraction consists almost entirely of 

 n-hexane with a small amount of methylpentamethylene. 



Fraction 75° -85°. Sp. gr. 0*7266 (20°), N D 25° 1*4020. 

 Here, also, we probably find n-hexane and methylpentame- 

 thylene and also hexamethylene boiling at 81°4 sp. gr. 0*7771 

 (15°)§ ]Sr D 18° 1*42897.1 



Fraction 85° -95°. Sp. gr. 0*7270, JS T D 25° 1*4032. Ethy- 

 lisoamyll boils at 90*5°, sp. gr. 0*6819 (17*5); 1, 3, 

 dimethylcyclopentane** boils at 91°, sp. gr. 0*7410 (24°/4°), 

 N D 18° 1*4253. Evidently contains both paraffins and naph- 

 thenes. 



Fraction 95° -105°. Sp. gr. 0*7308 (20°), JST D 25° 1*4061. 

 n-Heptane boils 98*4°, ft sp- gr. 0*6886 (15°), %% N D 20° 

 1*3854 ;§§ methylcvclohexanellH boils 103°, sp. gr. 0*7662 

 (18*5 /4°), N D 19° 1*4243.11 Paraffins and naphthenes both 

 are present. 



Fraction 105°- 115°. Sp. gr. 0*7387 (20°), N D 25° 1*4112. 



Fraction 115°-125°. Sp. gr. 0*7392 (20°), N D 25° 1*4121. 

 n-Octane boils 125*5°,*** sp. gr. 0*7020 (20°),ttt n d 

 1*3943 \\XX two unknown octanes described by Mabery and 

 Hudson§§§ boil at 119*5° and 124°-125°, and have gravities 

 (20°) of 0*7243 and 0*7134; octonaphthene|||||| boils at 119°, 

 sp. gr. 0*7503 (18°) JST D 20° 1*4234 ;Tf T isooctonaphthene**** 

 boils at 124°, and has sp. gr. 0*7637 (17*5°). The percentage 

 of naphthenes in each fraction seems to increase with the tem- 

 perature. In this fraction, nearly equal amounts of paraffins 

 and naphthenes are present. 



Fraction 125° -135°. Sp. gr. 0*7477 (20°), ]ST D 25° 1*4162. 

 £-Nonanefttt boils 129*5°, sp. gr. 0*725 (24*7°) ; nonanaph- 

 theneJttt boils 135° -136°, sp. gr. 0*7667 (20°/0°). Here also 

 is a mixture of the two classes of hydrocarbons. 



Fraction 135°-145°. Sp. gr. 0*7517 (20°), N D 25° 1*4181. 

 a-Nonane§§§§ boils 135° -137° and has sp. gr. 0*742 (12 4°). 



From these constants we can see that the lower boiling 

 hydrocarbons are of the paraffin series while those coming over 



* Engler and Routala, Ber. xlii, 4615. f Engler and Routala, loc. cit. 



% Fortey, J. Chem. Soc, lxxiii, 932. § Fortey, loc. cit. 



I Engler and Routala, loc. cit. *1J Schorlemer, Ann., cxxxvi, 259. 



*"* Engler and Routala, loc. cit. 



ff Francis, Young, J. Chem. Soc, lxxiii, 921. 



J:}: Thorpe, Ann., cxcviii, 364. §§ Engler and Routala, loc. cit. 



If Knoevenagel, Ann., ccxcvii, 159. *^[**[f Zelinsky, Ber., xxviii, 1022. 



*** Thorpe, J. Chem. Soc, xxxvii, 217. f ft Engler and Routala, loc. cit. 



XXX Engler and Routala, loc cit. §§§ Am. Chem. J., xix, 255. 



Hill Engier and Routala, loc cit. ^["[[Knoevenagel, loc. cit. 



**** Engler and Routala, loc. cit. 



tflf Lemoine, Bull. Soc. Chem., Paris, xli, 164. 



XXXX Konowalow, J. Russ. Chem. Ges., xix, 255. 



§§§§ Lemoine. 



