Islands in Favour of the Age and Area Theory of Willis . 51:9 
were Darwinian evolutionists, but many were not. The last, subordinating 
their theory to their practice, were, as I am willing to believe, ‘ differentia- 
tionists 1 at heart, holding, like their predecessors, ideas of divergence or 
differentiation of types, but ideas admittedly crude, and such as Hooker 
held in the shape of 4 Centrifugal Variation ’ through much of his career. 
In their theory, as I take it, they followed Nature on her broadest lines, 
and they did their best to put it into their practice. This is the position 
to which the Age and Area theory will bring us back, a position that has 
been for a long while greatly obscured by the clouds of dust that have been 
raised in the Darwinian controversies. It is certain that this theory will 
be involved in a general differentiation hypothesis of some kind. Whether 
that position will be provisional or permanent, time will show. At all 
events the two views of Differentiation and of Age and Area seem to be 
inextricably bound together now. 
List of the Macaronesiau Species of Flowering Plants in the Canary Islands , 
being those also found in other Groups of the Macaronesian Floral 
Region (Azores, Madeiras, Cape Verdes ), but not known outside it. 
The letters after the names signify as follows : A = Azores ; M = 
Madeira ; V = Cape Verdes. 
The arrangement adopted by Christ has been followed. 
Ranunculus cortusaefolius. M. 
Dichroanthus mutabilis. M 
Lobularia intermedia. V. 
Fumaria montana. V. 
Laurus canariensis. A, M. 
Phoebe barbusana. M. 
Persea indica. A, M. 
Oreodaphne foetens. M. 
Hypericum (Androsaemum) grandi- 
florum. M. 
„ glandulosum, M. 
,, floribundum. M. 
Visnea mocanera. M. 
Geranium anemonaefolium. M. 
Ilex canariensis. A (?), M. 
Rhamnus glandulosa. A (?), M. 
Euphorbia mellifera. A (?), M (?). 
Bupleurum salicifolium. M. 
Sempervivum (Aichryson) radices- 
cens. M. 
Bencomia caudata. M. 
Cytisus stenopetalus. V. 
Jasminum odoratissimum (barre- 
lieri). M. 
Picconia excelsa. A, M. 
Heberdenia excelsa. M. 
Clethra arborea. M. 1 
Echium stenosiphon. V. 
„ candidans. M. 
Campylanthus salsoloides. V. 
Lavandula pinnata. M. 
Micromeria varia. M. 
Cedronella canariensis. M. 
Leucophae massoniana. M. 
Teucrium (Poliodendron) hetero- 
phyllum. M. 
1 Not found in the Canaries since 1828. 
