at more or less regular periods, producing this remarkable 

 appearance. Now, it happens that the spot which produces 

 a variety of these produces also the Botryoidal Stinkstein 

 in great abundance and variety: see tab. 38. They are 

 generally found filled with a dusty ochraceous marie, such 

 as would readily allow scattered drops of water to collect it 

 on their surfaces. 



I received most of my specimens from my friend 

 N. J. Winch, Esq., who collected them near Sunderland. 



