\n Epilogue 



The advantage of such a hst of species will bc clear to ah and will 

 I hope save much future labour. 



I gladly acknowledge the continued help afforded to me by those 

 colleagues whose names I listed in my previous Introduction and to 

 those may be added the following whose assistance has been of great 

 value to me during these later years: J. Ardagh, G. J. Arrow, Maj. 



E. E. Austen, R. Bakcr, D. Bannerman, F. Barnett, W. E. Barnett, 

 J. C. Battersby, H. A. Bayhs, K. G. Blair, E. Browning, G. E. Bryant, 

 M. Burton, E. A. R. Bush. W. E. China, G. W. F. Claxton, Prof. 



F. J. Cole, L. R. Cox, F. W. Edwards, W. J. Fox of Philadelphia, 

 A. G. Gabriel, F. J. Griflfin, L. Guillaume of Strasbourg, M. J. Hardy, 

 Capt. A. F. Hemming, M. A. C. Hinton, A. S. Hirst, A. T. Hopwood, 

 D. E. Kimmins, N. B. Kinnear, R. Kirkpatrick, F. Laing, W. D. Lang, 

 J. R. Loewe of Berhn, Sir G. A. K. Marshall, C. C. A. Monro, G. H. G. 

 Mower, J. J. Mugford, Baron Nopsca of Vienna, J. R. Norman, 

 H. W. Parker, W. H. Perrett, C. Tate Regan, A. Reeley, F. Reeley, 

 Capt. N. D. Riley, G. C. Robson, A. E. Salisbury, F. C. Sawyer, 

 W. L. Sclater, H. "Seely, G. A. Smith, G. F. H. Smith, B. H. Soulsby, 

 H. Stringcr, W. E. Swinton, W. H. T. Tams, H. D. Thomas, Capt. 

 A. K. Totton, A. C. Townsend, H. B. Usher, B. P. Uvarov. J. C. 

 Vickery, T. F. Vincent, J. Waterston, R. J. West, E. L White, 



G. P. Whitley of Sydney, R. Winckworth, C. Wood. 



Sir Sidney Harmer (Polyzoa), G. M. Mathews (Birds) and T. H. 

 Withers (throughout), have read my proofs to my great satisfaction. 



As regards the printers all I need say is that hundreds of pages 

 have come to me without a typographical error and of the alterations 

 made by me the bulk have been my own fancies, wrong alphabetical 

 arrangements or additional matter. No words can sufficiently thank 

 the compositors and readers of the Cambridge University Press for the 

 exceptional care shown by them in interpreting my manuscript and 

 I thank them heartily. 



Now my work is finished it may be well to glance at the difhculties 

 met with during its compilation. Li any well-appointed Natural 

 History Library there should be found every book and every edition 

 of every book dealing in the remotest way with the subjects con- 

 cerned. One ncver knows wherein one edition differs from or 

 supplements the other and unless these are on the same table at the 

 same time it is not possible to collate them properly. Moreover for 

 accurate v/ork it is necessary for the student to verify every reference 

 he may find ; it is not enough to copy f rom a previous author ; he must 

 verify each reference itself from the original. Bad work, for which 

 therc is little excuse, is only too common. This want of every book 

 and every edition has bccn a serious hindrance and loss of time to 



