256 BULLETIN 42, UNITED STATES NATIONAL MUSEUM. 



Wherever organic material is exposed to decomposing influences g«s 

 is very sure to be given off", but it is onJy when this decomposition occurs 

 under conditions suitable for storing and saving the gas that it becomes 

 of practical value. 



Natural gas has been used in small quantities for heating and light- 

 ing for many years, but recently the discovery of abundant supplies of 

 gas in New York, Pennsylvania, Ohio, and Indiana has led to its ex- 

 teusiv^e employment for heating and lighting upon a large scale. It is 

 illustrated by a single specimen only as there is so little difference 

 apparent between different samples. (59989.) 



