168 PROCEEDINGS OF THE AMERICAN ACADEMY. 



I. 0.2059 gram of the substance gave 0.1515 gram AgCl. 

 II. 0.2064 gram of the substance gave 0.5357 gram CO.., and 0.2128 

 gram HoO. 



Calculated for Found. 



CiaHosCl. I. II. 



C 71.06 70.79 



H 11.30 11.46 



CI 17.53 18.20 



The specific gravity of this chlorine derivative determined at 20° was 

 found to be 0.8960. The small quantity of distillate collected within 

 higher limits did not permit of the separation of a dichlor derivative in a 

 pure condition. A chlorine determination gave 27.21 ; required for 

 Ci2H22Cl2, 29.95. It formed a thick viscous oil that could scarcely be 

 distilled even in vacuo without decomposition. At a temperature 

 slightly liigher than where this product was collected the distillate was 

 largely decomposed. 



The series having been determined bv these numbers, the number of 

 carbon atoms was demonstrated by the molecular weight, which was found 

 by the Beckmann method to be 172 ; the formula C10H.24 requires 168. 



What has been said as to the jn'obability that Pelouze and Cahours 

 operated on Canadian petroleum receives further support in comparing 

 their results on the hydrocarbon they separated boiling at 216°-218° 

 with those described above, although certain important differences appear 

 between their results and mine. 



The specific gravity assigned by them to the hydrocarbon 21 6° -2 18° 

 was 0.796 at 20°, which is practically the same as the specific gravity of 

 my crude distillate, 0.7947, given above. But their description of the 

 properties of this distillate are not in accordance with my observations. 

 Referring to the action of reagents on their product, they state : " Le 

 brome, I'acide azotique fumant, I'acide sulfurique fumant, ainsi que le 

 melange de ces deux acides se comportent a son egard comme avec le 

 compose precedent." And after stating, in the description of the pre- 

 ceding compound, that it is not attacked in the cold by bromine, fuming 

 nitric acid, sulphuric acid at the maximum of concentration with nitric 

 acid, nor by fuming sulphuric acid, they state : " Le melange des acides 

 azotique et sulfurique agit sur le earbure lorsqu'on maintient ces corps 

 pendant quelque temps en ebullition." That this observation does not rep- 

 resent correctly the behavior of this distillate from Pennsylvania nor Ohio, 

 nor Canadian petroleum, has been clearly shown by experiments described 

 in this paper. It is especially inapplicable to the Canadian distillate, 



