Oil of Peppermint. 441 



by repeated distillations it has a specific gravity of 0'8998, 

 and boils between 370° and 380° Fahr. 

 " The following are the analytical results : 



A. Material = 0*2905 gramme gave 



Water = 0-318 



Carbonic acid = 0*8 12 



B. Material = 0*3667 gramme gave 



Water = 0*407 



Carbonic acid = 1*035 



C. Material = 0*3443 gramme gave 



Water = 0*375 



Carbonic acid = 0*969 

 Hence there is per cent. 



A. B. C. 



Carbon = 77*29 78*06 77*81 



Hydrogen = 12*11 12*32 12*01 



Oxygen = 10*60 9*62 10*18 



The analyses A and B were made with the same specimen 

 of oil; the correct value for carbon is therefore that of B. 

 The analysis C was made subsequently with a different spe- 

 cimen. 



The formula C^i Hgo Og gives 



Cgi = 128*9 78-14^ 



U^o- 20*0 12*12^ 100 



O2 = 16*0 9'74>j 



I cannot explain the difference between this result and that 

 of Blanchet and Sell, as they give no account of the circum- 

 stances under which their analyses were made. They make 

 no mention of having submitted their oil to rectification. 

 Their result is C12 Hiq O, and per cent. 

 Experiments. 

 Carbon = 79*63 79*53 



Hydrogen = 11*25 10*77 10*90 J> 100 



Oxygen = 9*12 9*70 



Blanchet's result for the stearopten of oil of peppermint, 

 though discordant with itself, yet approaches closer to mine 

 for the oil. Thus he obtained for the' solid crystalline stear- 

 opten CjQ HjQ O, and per cent. 



Experiments. Mean. Theory. 



Carbon = 79*63 77*27 78*45 77*281 

 Hydrogen = 11*25 12*96 12*11 12*59 WOO 



Oxygen = 9*12 9*77 9*44 10*12 J 



On analysing the first portion obtained in rectifying oil of 

 peppermint, which had a boiling point about ten degrees 



