* 
80 C. M. Warren on the Volatile Hydrocarbons. 
tained in the pursuit of this object are abundantly sufficient to 
show that I did not undervalue the work of my predecessors, 
tion from its associates, of being crystallizable at a low tempera- 
ture, thus affording an additional test of the purity of the product 
which might be obtained by the process of fractioning. Some- 
what to my surprise I found that, after only the fifth series of 
fractionings, I had obtained benzole so nearly pure that the whole 
of it would distil from a tubulated retort between 80° and 81° 
C.; and that when congealed, which was effected by placing the 
containing bottle in pounded ice, not a drop of liquid could be 
rom the mass of crystals. From this result,—which, at 
east, indicated a near approximation to Pays taken in con- 
nection with other favorable indications, I felt confident that I 
had accomplished my first object, and had found a process that 
could, in all probability, be successfully applied in the study of 
the petroleums, which up to that time (1861) had baffled every 
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