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VI 



PREFACE. 



existed in any European museum, I am under particular obligations. The late Marquis 

 of Tweeddale, in whose sudden death this science sustained a grievous loss, was always 

 ready to aid me by the loan of specimens from his magnificent collection, otherwise 

 unobtainable, and by any other assistance it was in his power to bestow. To my 

 friends Osbert Salvin, Esq., Dr. Sclater, Prof. Bocage, Captain Ramsay, R. B. Sharpe, 

 Esq., Captain Shelley, Prof, Cabanis, Prof. Schlegel, Mons. A. von Bemmelin, Prof. A. 

 Milne-Edwards, and Mons. Oustelet I desire to acknowledge my indebtedness for 

 assistance on many different occasions: 



The drawings, the happy results of Mr. Keuleman's talented pencil, most 

 characteristically depict the strange forms and attitudes of these curious birds. 



The colouring of the Plates has been successfully accomplished by Mr. Smith ; while 

 the letterpress by Messrs. Taylor and Francis leaves nothing to be desired, and the 

 printing of the Plates by Messrs. M. and N. Hanhart has been most carefully executed. 



The length of time during which the publication of the various Parts has extended 

 was caused by circumstances entirely beyond my control ; but I w r ould especially 

 express my thanks to those who have honoured my work with their support, and 

 patiently awaited its completion. D. G. E. 



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