262 7 Scientific Intelligence. 
has compared this auro-chlorid with the sam 
yielding 31°8 per cent of platinum, the theoretical quantity. Moist 
8. Hydrocarbons of the Pennsylvania Petroleum; by C. M. 
ARREN, (from a letter to J. D. Dana, dated Brookline, 25 Feb., 
those of Pelouze and Cahours. ut I contend that the superiority 
it not seemed more a gee that these should appear ee 
sults, I desired to repeat some of the elementary analyses, by ca 4 
pro the hope of obtaining more exact results whic 
. 
memoir) to raise a doubt on this point, would not justify di 
formule rom those that I published. : ‘ sees 
I will give below a few of my analyses and on oa densities, in- 
2 of one or two members of each of my three series- 
are well grounded, especially those of the 3d series, 
