448 Kerr (rmiif : Obsididnites. 



Both primary and secondary features of form, therefore, while 

 they do not negative a terrestrial oriszin. accord at least equally 

 well with an extra-terrestrial. 



It is much to be regretted that the few hollow specimens of 

 Obsidianites which have been found have been cut open without 

 the collection of the contained gas, an analysis of which would 

 probably throw light on tlie true nature of the oljjects. The 

 author would be nuich indebted to any person possessing an ob- 

 sidianite of specific gravity lower than 2.38, which would pro- 

 bal)lv indicate cavities inside, who would communicate with him. 



