186 
are smallest, and most irregular ; of the outer ones some are 
nearly perfect, others slipped off, if I may use the expres- 
sion; and the nuclei falling on each other somewhat irre- 
gularly are lengthened out beyond the proper angle; some 
are a little rounded, and some flattish ; others have trunca- 
tions on their angles, &c.—see fig. 1, 2, 3, 4.—and in 
some instances resemble the Pearl-spar, al. 19. 
I have a specimen that was in the collection of my late 
Jamented friend Mr. Day, from Matlock, that has quartzose 
tubes which have much the appearance of the Coral, tab. 
292, each surrounded by Cubic Fluor and Sulphate of 
Barytes in nearly lenticular crytals, like tab. 96. 
