VANADIUM WITH PETROLEUM AND ASPHALT 371 



enough to be broken with the hands and strongly resembled asphalt in 

 appearance. When air was excluded no thickening occurred during the 

 time the investigating was going on. In another experiment a thin paste 

 of natural ore and petroleum was left in the open on a watch glass and 

 thickened considerably in a few days. 



During the process of asphalting a number of interesting things ap- 

 peared. These will be more fully investigated later, and at the same time 

 an examination of the asphalt-like product will be made which will be more 

 satisfactory than could be made in the time at our command. 



