ON THE OCCURRENCE OF ALUMINIUM IN CERTAIN CRYPTOGAMS, 341 
ave met since with general acceptance. -What I have at present done 
has been to examine other species of the same genus, Lycopodium, and 
e ash nor increased its percentage of alumina, it was considered 
that all extraneous matter had been removed. The following per- 
b d 
centages were finally obtained :— 
: d 
in —s, 
Dry Plant. Al,03. Si0,. 
3°68 
Percentage 100 parts of Ash 
of Ash containe 
2°80 15°24 6°40 
The next point to be settled was the absence or presence of 
alumina in the species of the closely-allied genus Selaginella. I ob- 
tained a good supply of S. Martensit var. robusta (the var. y compacta 
of A. Braun), and ‘thoroughly cleansed it previous®to analysis, It 
gave :— 
Percentage 100 parts of Ash 
of reg soniiinel 
pues Rae, 
Dry Plant, AlOs. SiOz. 
Selaginella Martensii . : 11°66 0°26 41-03 
Practically, this 3 per cent. of Al,O, must be regarded as accidental, 
and we may conclude that this constituent is absent from the plant in 
question. : 
Further, to see whether alumina is really distinctive of Lycopo- 
