62 ON THE VAEIOLITIC DIABASE OF THE FICHTELGEBIRGE. 



matter deposited in optical continuity with the crystalline fibres 

 on either side. 



7. In regard to the terms used, it should be explained that the 

 word diabase has been retained in Hausmann's sense ; most of this 

 rock, however, is more strictly an augite-porphyrite, probably 

 resulting from the alteration of an augite-andesite. The varioles 

 have been throughout referred to as spherulites^ from the belief that 

 the Tariations in structure which place them among the " pseudo- 

 spherulites" of Prof. Eosenbusch are due solely to secondary 

 alterations. 



