342 ON THE OCCURRENCE OF ALUMINIUM IN CERTAIN CRYPTOGAMS. 
dium, and is always absent from Selaginella, other trials were made. 
A quantity of another species of Lycopodium, L. Selago, was obtained 
from Saco stmoreland, and cleansed and burnt, with the following re- 
Percentage 100 parts of Ash 
of Ash contained 
in aa 
Dry plant. AlsO;. SiOz. 
LI. Selago  . ? 3°20 7:29 = _-:2°58 
A result perfectly ikea my former conclusions, and the 
particularly so, as the group of Lycopodia to which L. Selago pelea 
is separated from the group to which Z. alpinum belongs by that to 
which LZ. clavatum belongs, thus :— 
Order 
Botanical Series, according to Percentage of 
Alumina. 
Fas: .  L.alpinum ees : . 83°50 
oe . L. clavatum ae i 15°24 
$35 ‘ L. Selago See i ; 7:29 
Now there is a most interesting British Selaginella, the only species 
found in these islands, and a seg which has been ranged amongst 
the Lycopodia until the las t few bir rs, when fa was separated on 
ing an 
Percentage 100 parts of Ash 
of Ash contain 
in (os 
Dry Plant. Al,0;. Si0,. 
Selaginella spinulosa . : 3°44 none 6°67 
A good supply of this plant was kindly obtained for me from Largo 
Links, Fife, by Mr. Howie of Largo 
Many at remain to be rien" by farther research ¢ 
cerning this occurrence of aluminium in species of Lycopodium. Is te 
nected with the present inquiry, and have searched for and fail 
find alumina in ig ashes of the following vert ded cat, more or less 
nearly related to ——— 
setum maximum. 
Cia omen ve 
Psilotum triquetrum. 
I hope to analyse species of Phylloglossum and bag fo age 
genera of esate closely allied to Lycopodium. Isoet ee 
is separated from Lycopodium by Selaginella, should also abe studied in 
this Sa iled: 
In the following table the peonlin recorded in the present paper 
resented in a compact form 
