MEMOIR. xxi 
omitted. Among these are the formation of the Amazons delta, 
which differs from other deltas in not being wholly alluvial ;* the 
absence of domesticable animals as affecting the character and 
culture of races; the gradual adaptation of the fauna of the 
Amazons during an immense lapse of time to a forest-clad country, 
the examples of which are of great interest ; the origin of species 
as illustrated by certain butterflies of the genus Helzconius; the 
keenness of insect instinct of locality as shown by the sand wasp ; 
the habits of the colonies of white ants, with their military 
organisation; and, what are of high value, observations on 
the monkeys of the Amazons region (of which Bates found 
thirty-eight species, belonging to twelve different genera), and 
comparisons between them and their more diversified congeners 
of the Old World. Then there are scattered references to 
mimetic analogies which further illustrate the celebrated paper. 
Consequently, the decision of Mr. Murray to reprint the first 
edition is matter of congratulation, as also the payment of a 
fitting tribute to the author, who again and again regretted the 
abridgment. Bates kept no journals after his return from the 
Amazons—unfortunately only those relating to the years 1848-51 
are preserved—and the following are the only notes (graphic 
enough to cause regret that there are no more) approaching to 
the form of a diary that have been found amongst his papers :— 
“* Sunday, November 29th, 1863.—This afternoon, when walking in the 
Zoological Gardens with little Alice and the maid, Sir Charles Lyell accosted 
me near the seal pond, and we walked about together for an hourorso. He 
was wriggling about in his usual way, with spy-glass raised by fits and starts 
to the eye, and began; ‘ Mr. Wallace, I believe—ah—’ ‘ My name’s Bates.’ 
‘Oh, I beg pardon, I always confound you two.’ (His memory must be very 
bad, for we have often met, and I was once his guest at the Geological Club 
dinner, Clunn’s Hotel, Covent Garden.) ‘ Ah—did you see the new porpoise 
the other day?’ ‘No; I did not happen to be in the gardens, and it lived 
but a very short time.’ He then passed on to something else; asked whether 
I was a relation of Mr. Spence Bate, who had just written to him about the 
discovery of ‘ Kjdkkenméddings,’ at Swansea, and so forth. 
‘*We then began talking about my book of travels, and I told him I had 
just received a request from Mr. Murray to prepare a second abridged and 
popular edition. It was a capital opportunity to get good advice about 
second editions and abridgments, so I asked Sir Charles what he would 
recommend me to do. 
* “One ot my little theories is that part of the delta of the Amazons was land, 
probably an island, while most of the alluvial plain was under water, and that the 
Amazon waters have broken through it.”—Zetler to Darwin, January 6th, 1862. 
