From the PREFACE: 

It seems almost unnecessary to say that "Round the World," like
"An American Four-in-Hand in Britain," was originally printed for
private circulation. My publishers having asked permission to give
it to the public, I have been induced to undertake the slight
revision, and to make some additions necessary to fit the original
for general circulation, not so much by the favorable reception
accorded to the "Four-in-Hand" in England as well as in America,
nor even by the flattering words of the critics who have dealt so
kindly with it, but chiefly because of many valued letters which
entire strangers have been so extremely good as to take the
trouble to write to me, and which indeed are still coming almost
daily. Some of these are from invalids who thank me for making the
days during which they read the book pass more brightly than
before. Can any knowledge be sweeter to one than this? These
letters are precious to me, and it is their writers who are mainly
responsible for this second volume, especially since some who have
thus written have asked where it could be obtained and I have no
copies to send to them, which it would have given me a rare
pleasure to be able to do.

I hope they will like it as they did the other. Some friends
consider it better; others prefer the "Four-in-Hand." I think them
different. While coaching I was more joyously happy; during the
journey round the World I was gaining more knowledge; but if my
readers like me half as well in the latter as in the former mood,
I shall have only too much cause to subscribe myself with sincere
thanks,

     Most gratefully,

     THE AUTHOR.