found in Urpeth Colliery, near Neivcastle. 



397 



2. One soluble in cold ether. — (I. and II. B.J 



3. One soluble in boiling ether, and sparingly in boiling alcohol. — (II % 

 B. III. C.J 



4. A residual portion of greater density scarcely acted on by either 

 of these menstrua. — (III. D.J 



The different substances composing the Ozocerite appear as I have al- 

 ready stated to be identical in chemical constitution, being entirely com- 

 posed of carbon and hydrogen, in the same proportions as in olefiant gas. 

 That the substance from Urpeth Colliery contains no oxygen, is proved by 

 its not affecting the lustre of potassium, when melted along with it. The 

 carbon and hydrogen were ascertained by burning with oxide of copper. 



1. 8"43 grs. of the crude mass, freed by fusion from adhering earthy 

 matter, gave 10 - 69 grs. of water, or 1 - 187 grs. of hydrogen. 



2. 5'47 grs. of the matter taken up by ether, gave 6"92 grs. of water, 

 or - 77 grs. of hydrogen. 



3. 5"84 grs. of the same gave 7'39 grs. of water and 18*32 grs. of car- 

 bonic acid. 



4. 5 - 47 grs. of the same gave 6*72 grs. of water and 16*58 grs. of car- 

 bonic acid. 



These results give for the crude mixed mineral, and for the portion so- 

 luble in ether, the same composition. 





1. 



2. 



3. 



4. 



1409 

 85-81 



1407 

 85-83 



1406 

 86-80 



13-649 

 83812 



100 



100 



100-86 



97-461 



The ratio of the elements in the fourth analysis is that of atom to atom ; 

 the loss I attribute to the pumping out of a portion of the substance from 

 the tube along with the moisture contained in the oxide of copper, the sand 

 with which the tube was warmed in this experiment having been too hot 

 for a substance boiling so low as 250° F. 



The small portion of matter at my disposal prevented me from subject- 

 ing to analysis either of the other compounds contained in the crude mass ; 

 the composition of this mass, however, as exhibited in No. I., shows that 

 these also must contain the elements in the same proportion as the matter 

 actually analysed. 



vol. n. 4 B 



