But though many of the details given in these
volumes would now require alteration, there is no reason to believe that
the great features of the work and general principles established by it
will require any important modification."[4]
About this time he wrote the article on "Acclimatisation" for the
"Encyclopaedia Britannica"; and another on "Distribution-Zoology" for the
same work. As President of the Biological Section of the British
Association he prepared an address for the meeting at Glasgow; wrote a
number of articles and reviews, as well as his remarkable book on
"Miracles and Modern Spiritualism." In 1878 he published "Tropical
Nature," in which he gave a general sketch of the climate, vegetation,
and animal life of the equatorial zone of the tropics from his own
observations in both hemispheres. The chief novelty was, according to
his own opinion, in the chapter on "climate," in which he endeavoured to
show the exact causes which produce the difference between the uniform
climate of the equatorial zone, and that of June and July in England.
Although at that time _we_ receive actually more of the light and heat
of the sun than does Java or Trinidad in December, yet these places have
then a mean temperature very much higher than ours. It contained also a
chapter on humming-birds, as illustrating the luxuriance of tropical
nature; and others on the colours of animals and of plants, and on
various biological problems.
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