140 PROCEEDINGS OP THE AMERICAN ACADEMY. 



as in those of lower boiling points. In fractioning under 80 mm. after 

 six distillations, about 20 c.c. collected at 142°-153°, which distilled at 

 230°-235° atmospheric pressure. In none of the distillates of chlorine 

 derivatives was hydrochloric acid detected as a product of decomposition 

 when distilled in vacuo. Under atmospheric pressure it was impossible 

 to carry on these distillations without serious decomposition. The com- 

 position of this fraction corresponded to that of CiaHajCl. 



I. 0.1910 gram of the oil gave 0.1385 gram AgCl. 

 II. 0.1339 gram of the oil gave 0.3434 gram CO.,, and 0.1423 gram 

 H2O. 



• Found. 



I. II. 



69.93 

 11.81 

 17.93 



In determining the specific gravity of this chlorine derivative at 20°, it 

 gave 0.8919. A determination of its molecular weight by the Beckmann 

 method, with benzol as a solvent, gave Mr. Hudson 200 ; required for 

 C12H25CI, 204. The chloride formed by Pelouze and Cahours from 

 their distillate 216°-218° boiled at 2o8°-260°, somewhat higher than 

 the boiling point of the chloride described in this paper. From the 

 results of their analyses, they deduced the formula Ci^H^iGi. 



The chlorination of this product was not carried far enough fo form 

 sufficient of the dichlor derivative to separate it by distillation. The 

 greater part of the oil after chlorination distilled at 212°-214°, the 

 boiling point of the hydrocarbon. 



A description of these experiments, which are intended to establish the 

 composition of the hydrocarbon distilling at 214°-216°, should not be 

 concluded without a "statement of the relation they sustain to those of 

 Warren and of Pelouze and Cahours, the only experimenters who have 

 hitherto attempted the separation of this constituent from American 

 petroleum. The two determinations most nearly concerned in this dis- 

 cussion are specific gravity and percentage composition. In the following 

 comparison of specific gravity determinations and percentage composition, 

 it should be borne in mind that Warren purified his distillate only by 

 boiling with metallic sodium, Pelouze and Cahours by agitation with 

 concentrated sulphuric acid and washing with sodic carbonate ; with 

 those resnlts are brouglit together the determinations described in this 

 paper in the crude distillate, after agitation with concentrated sulphuric 

 acid, and after more thorough purification with the acid mixture : — 



