VI 
PREFACE. 
of this nature could have been successfully completed; and I am proud to bear my tes¬ 
timony to the liberal spirit which has been manifested towards me by the scientific world 
in general. Among those to whom I am especially indebted I may mention the Earl of 
Derby, Prince Massena, of Paris, M. Temminck, M. John Natterer, of Vienna, Dr. Lichten¬ 
stein, of Berlin, W. Swainson, Esq., Sir William Jardine, Bart., and T. C. Eyton, Esq. My 
thanks are also due to my friend Mr. Martin, of the Zoological Society of London, for the 
kind manner in which he has at all times rendered me his assistance in this and my other 
publications.” 
Of the honoured friends mentioned in the foregoing paragraph, only one, Mr. Eyton, 
remains to me; all the others, alas! have passed away. In writing again a preface to 
a Monograph of the Trogonidse, it is impossible not to recall their memory with a sigh ; 
but at the same time it would be wrong to allow regrets to mingle with the acknowledgments 
which are due to my friends and coadjutors of the present day. It is with pleasure that 
I recognize the fact that for every single student of ornithology to be found forty 
years ago, there are at least twenty now; and I cannot close these remarks without 
recording my obligations to Dr. Sclater, Mr. Salvin, and Mr. Bowdler Sharpe for the 
assistance they have rendered me in the preparation of this second edition. With the 
history of this family will also be remembered the names of Mr. Lawrence and 
Professor Baird in America, Dr. Finsch of Bremen, Herr A. von Pelzeln of Vienna, and 
especially Drs. Cabanis and Heine, who, in their well-known ‘Museum Ileineanum,' 
have given a very elaborate descriptive review of the family; and, although not acqui¬ 
escing in all their conclusions, I must acknowledge my frequent obligations to this 
useful work. 
Lastly I have to remark that, although I entitle this work a second edition of 
the Trogonidse, it is in reality a new publication, all the plates having been redrawn, 
and many new species figured for the first time, so as to bring the history of the 
family down to the present day. 
4 
