vi PREFACE. By arrangement, the work forms one of the Special Memoirs of the Essex Field Club, that body having made a grant towards the expenses of printing. I have endeavoured to make my book as complete as possible by adding to it, among other matters, some remarks on the chief Physical Features of the County of Essex, brief biographical notices of the principal Essex Ornithologists, descriptions of the most important collections of birds within the County, an account of Decoys and Decoying in Essex, and a Chronological List of published works, &c., referred to and quoted from. No one can be more fully aware than I am myself of the incompleteness of my book. A complete work of the kind is, indeed, impossible. Fresh observations are continu- ally being made and many records of old ones, which have escaped my notice, will doubtless be discovered. The chief use of such a work as mine is to collect all the information available up to a certain date, and, by showing the incom- pleteness of our local knowledge, to stimulate others to fill the gaps and extend general observation on the habits and distribution of birds. Thus my work will fail in its object if it does not quickly show its own incompleteness. I have introduced the illustrations because I believe that they will largely add to the popularity of my book. Though not so good or so uniform a series as might have been wished, I believe they will be found useful by many of my readers who are not skilled ornithologists. In some, a resem- blance may be traced to the well-known cuts in Yarrell's standard British Birds. These originally appeared, many years ago, in a now-almost-forgotten work which at the time of its publication figured in the law courts, the publishers being condemned to pay damages for infringement of copy- right. I now use the cuts with the concurrence of Messrs. Gurney and Jackson, the present owners of the copyright in Yarrell's work. Some others will be seen to be merely reduced