Silliman and Wurtz on Air and Gas. 41° 
mixture.* The apparatus employed consisted of two gas tech 
ers of ten cubic feet capacity each, connected in such a m 
ner that each could be used independently, or the contents Sof 
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| one transferred to the other and back again to secure a com- 
_ plete admixture of the contents. The air was introduced. by 
| — a pi cock. — with the interior and adding 
n this research have been greatly aided by the facilities courte- 
4 aie ied to us by the elias of —* — an Gas Light Company, in 
New York, who with great liberality place ae aay i eir well appointed 
experimental laboratory and apparatus at eae Righteenth- -Street Station. 
a 
