EXAMINATION OF A NAPlrTIIA FROM LIME-SOAP. 191 



suit until such time as a method of properly purifying our first product Aall have been 

 discovered. The impurity of the material in question appeared, moreover, from the fi al- 

 lowing analysis: — 0.1656 grm. of the hydio-carbon gave 0.152 grm. water, and 0.5604 

 grm. carbonic acid, or 



Found. 



Carbon 90.64 



Hydrogen 10.20 



100.84 



This result indicates that the product still contained some sulphurated compound, 

 which, on combustion in the oxygen constantly present in the tube during the analv-ia, 

 forms sulphuric acid ; the latter condenses in the neck of the chloride of calcium tube 

 and so vitiates the hydrogen determination. 



A portion of the product just analyzed was now digested during twenty-four hours 

 with a quantity of concentrated chlorhydric acid, by which it was at once rendered 

 milky. After decanting the acid and washing with water, the hydro-carbon was dried 

 over hydrate of potash, and finally distilled upon sodium. On combustion, an un- 

 weighed portion of it gave 0.1679 grm. water, and 0.6345 grm. carbonic acid, or 



Found. 



Carbon 90.25 

 Hydrogen 9.75 



Theory 



Cu 91.3 

 Hs 8.7 



100,00 



100.00 



The liquid which had been treated with chlorhydric acid was now distilled in vacuo. 

 It began to boil at 66°, between which point and 68° a fraction was collected (No. I). 

 Another small fraction was then taken off above 98° (No. II.). 



On combustion, 0.1985 grm. of fraction No. I. gave 0.1 7C5 grm. water, and 0.6572 

 grm. carbonic acid. 



0.2595 grm. of fraction No. II. gave 0.2244 grm. water, and 0.8579 grm. carbonic 



acid. 



Found. 

 I. II. 



Carbon 90.07 90.17 



Hydrogen 9.87 9.60 



Theory. 



Cm 91.3 



H 8 8.7 



99.94 99.77 



100.0 



These results correspond respectively with the formulas : — I. C 14 II , 2 ; H- C u 

 H 897 ; the previous analysis, see above, agrees with the formula C u Hfj» The body 



