CATALOGUE OF HARDY SEMPERVIVUMS. 343 
Percentage 100 parts of Ash 
of Ash contain 
in | Foe aaa, | 
Dry Plant, Silica. Alumina. 
Lycopodium alpinum. J 3°68 10°24 = 33°50 
L. clavatum ‘ i ‘ 2°80 6°40 15°24 
LI. Selago . . : : ‘ 7°29 
Selaginella Martensii . ; 11-66 41:03 0°26 
Selaginella spinulosa . ‘ 3°44 6°67 none 
Equisetum maximum . y 20°02 62°95 none 
Ophioglossum vulgatum 5 8°25 5°32 none 
Pilotum triquetrum  . ‘ 5°06 3°77 trace (?) 
[From the “ Chemical News,” Sept. 18, 1874. ] 
CATALOGUE OF HARDY SEMPERVIVUMS. 
By J. G. Baer, F.L.S. 
80 much;in vogue ecorative purposes, I have often been aske 
by correspondents to draw up a classified list of the published 
species, so-c e in arranging collections, and sho 
r 
which of; the names used in gardens have really any botanica st and- 
ing. I have always declined this request, on the ground of want 
drawing up such a catalogu 
mens belong; and on the other hand, several of the older named 
forms have never been 
Synonyms. It would be a useful service if some of your correspon- 
dents who have time and opportunity of travelling about to see dif- 
