154 



collection. It is from Matlock in Derbyshire. It shows a 

 curious state of aggregation, crystallizing after solution, 

 running and dropping in very elegant and varied forms. 



The crystals sometimes line the tubes and nearly fill them 

 in a concentric manner like the common calcareous stalac- 

 tites : the tubes are often nearly empty. The outsides of 

 the tubes are covered with somewhat globular aggregations 

 of sharp lenticular crystals, some of which have very much 

 the appearance of globular crystals. 



