and the Seychelles." Mr. Wallace says that, judging from the soundings,
Round Island was connected with Mauritius, and that when it was "first
separated [it] would have been both much larger and much nearer the main
island.") which I owe to you. Was there ever such an enigma? If, in the
course of a week or two, you can find time to let me hear what you think, I
should very much like to hear: or we hope to be at Erasmus' on March 4th
for a week. Would there be any chance of your coming to luncheon then?
What a case it is. Palms, screw-pines, four snakes--not one being in main
island--lizards, insects, and not one land bird. But, above everything,
such a proportion of individual monocotyledons! The conditions do not seem
very different from the Tuff Galapagos Island, but, as far as I remember,
very few monocotyledons there. Then, again, the island seems to have been
elevated. I wonder much whether it stands out in the line of any oceanic
current, which does not so forcibly strike the main island? But why, oh,
why should so many monocotyledons have come there? or why should they have
survived there more than on the main island, if once connected? So, again,
I cannot conceive that four snakes should have become extinct in Mauritius
and survived on Round Island. For a moment I thought that Mauritius might
be the newer island, but the enormous degradation which the outer ring of
rocks has undergone flatly contradicts this, and the marine remains on the
summit of Round Island indicate the island to be comparatively new--unless,
indeed, they are fossil and extinct marine remains. Do tell me what you
think. There never was such an enigma. I rather lean to separate
immigration, with, of course, subsequent modification; some forms, of
course, also coming from Mauritius. Speaking of Mauritius reminds me that
I was so much pleased the day before yesterday by reading a review of a
book on the geology of St. Helena, by an officer who knew nothing of my
hurried observations, but confirms nearly all that I have said on the
general structure of the island, and on its marvellous denudation. The
geology of that island was like a novel.