Probably the "Catalogue of the Coleopterous Insects of the Canaries in the British Museum," 1864.) but must buy it, if it gives the facts about rare plants which you mention.
And now I have given more than enough of my notions, which I well know will be in flat contradiction with all yours.
Wollaston, in his "Insecta Maderensia" (365/5.

"Insecta Maderensia," London, 1854.), 4to, page 12, and in his "Variation of Species," pages 82-7, gives the case of apterous insects, but I remember I worked out some additional details.
I think he gives in these same works the proportion of European insects.
LETTER 366.

TO J.D.

HOOKER.
(366/1.

Sir Joseph had asked (July 31st, 1866): "Is there an evidence that the south of England and of Ireland were not submerged during the Glacial epoch, when the W.and N.of England were islands in a glacial sea?
And supposing they were above water, could the present Atlantic and N.W.of France floras we now find there have been there during the Glacial epoch ?--Yet this is what Forbes demands, page 346.