INVESTIGATION WITH A ROCK-SALT PRISM. 

 METHYLENE SERIES (CnHgn). 



7Z 



California : 



Dimethylpentamethylene j CvHn- . . 

 Methylhexamethylene . . ] C7H14. . . 

 Octylene or dimethylhexamethylene 



(CsHie) 



Decylene {C10H20) 



Pentadecylene (C15H30) 



Ohio oils : 



Dodecylene (Ci2H24) 



Hexadecylene (C16H32) 



Pennsylvania oils : 



Octadecylene (CigHse) 



Tricosylene (C23H46) 



Tetracosylene (C24H48) . • . • 



Boiling point. 



158° 



III°- 

 164°- 



166° 

 26o°- 



270° 



89°-90° 

 98°-99° 



I2I°-I22° 

 I62°-I64° 



-160° (50 mm.). 



-113° (30 mm.). 

 -168° (30 mm.). 



-170° (50 mm.). 

 -262° (50 mm.). 

 -272° (50 mm.). 



PARAFFIN SERIES (CnHgn + g). 



Pennsylvania oils : 



Hexane (Kahlbaum) (CeHu) 



Octane (CgHig) 



Decane { ^"^'^ 



( Cl0il22 



Dodecane (C12H26) 



Tetradecane (CuHso) 



Hexadecane (C16H34) 



Octadecane (CigH^s) 



Tricosane (C23H48) 



Tetracosane (C24H50) 



Pennsylvania oils (chlorine compounds 



of CnH2n+2): 



Monochlortridecane (C13H27CI) 



Monochlortetradecane (CitH29Cl) . . 

 Monochlortetradecane (C17H35CI) . . 

 Ohio petroleum : 



Hydrocarbon (C10H20S) 



69° 

 i48°-i20° 

 I 50°- 160° 

 i7o°-i72° 



209°-2IO° 



I34°-I36° (50 mm.). 

 i69°-i7i° (50 mm.). 

 2oo°-202° (50 mm.). 

 256°-258°(50 mm.). 

 274°-276° (50 mm.). 



i30°-i35° (12 mm.). 

 i45°-i50° (20 mm.). 

 i7o°-i73°(i5 mm.). 



«t Ot 



» 

 y 



» 



M 

 o 



i i, 4, 



M M M 



u \/ 



u 



ACETYLENE SERIES (CnH2n-2). 



Ohio oils: Hydrocarbon \ Si'^u^®' 



( *->22ti.42- 



It will be noticed that some compounds appear a little more trans- 

 parent than others in certain regions of the spectrum. This no doubt 

 is due to absorption bands which are obliterated in some and do not 

 exist at all in others. For example, dodecane (CigHje) has four small 

 absorption bands between 4 and 6 \x., while there are none in octadecy- 

 lene (CigHgg), but they are so small, i. e., narrow, that the large spec- 

 trometer was necessary to detect them. The solids were more trans- 



