88 PROCEEDINGS OP THE AMERICAN ACADEMY 



Homologues of Marsh Gas. 



"In calculating the boiling-points, it was assumed, as appears 

 to be the case, that the difference decreases regularly by 4 until it 

 reaches the well known difference 19°." 



* This Butane, C 4 H 10) corresponds to the first memher of my first series, 

 which I call the normal hydrides of the alcohol radicals, the series above given 

 being isomeric with the hydrides. 



According to my observations " Butane " should boil at about 8° to 9°, and its 

 isomeride at 0° instead of 1°. Taking 8° to 9° as the boiling-point of Butane, 

 the difference of boiling-point between it and " Pentane " would be 29° to 30°. 



Taking 29° to 30° as the starting point for his calculated differences, and 

 deducting 4° successively, we have 



29° to 30° - 4° = 25° to 26° Pentane and Hexane. 

 25° to 26° - 4° = 21° to 22° Hexane and Heptane. 

 21° to 22° - 4° = 17° to 18° Heptane and Octane. 



