METHODS Survey Area For the purpose of the Survey, Essex was regarded as the region ad- ministered by the Essex County Council together with the area, north of the river Thames and east of the river Lea, administered by the former London County Council. Deer show no respect for man's administrative divisions and so the above boundaries have been interpreted rather loosely. The names of places, together with the parish in which they occur, have been taken from the Provisional Edition of the 21/2 inch Ordnance Survey maps which were published from 1950 to 1961. Organisation of the Survey At the inaugural meetings, the aims of the Survey were explained and people were encouraged to act as observers. Notes giving guidance on deer observation and the completion of record cards were prepared and given to people expressing an interest in the Survey. A talk was arranged on the various species of deer occurring wild in Britain, including their identification and was followed by visits to deer parks. Initially, it was decided to hold meetings at various places in the county, the observers each investigating a different part of the surrounding area for the presence of deer. After the first year, it was decided to organise the Survey on a more systematic basis. Nine Local Recorders were appointed who each adopted one or more of the county's sixty-one 10 km squares. The duties of the Local Recorders were to encourage other observers and to record systematically the presence or absence of deer in their areas. Local Recorders compiled a summary of deer records received each month and sent it to me. Information about deer which was sent direct to me, was forwarded to the appropriate Local Recorder. To investigate areas of the county which were not covered by Local Recorders, meetings continued to be held. Newspapers and magazines, both local and national, were informed of the Survey and an appeal made to readers to report any deer seen. The appeal was repeated in 1971 when the results of the Survey were being updated. Since 1971 records of deer have continued to be collected, but on a more casual basis. Records Ideally, a deer survey should be based on actual sightings of animals by an experienced observer but such a council of perfection was impossible in a survey undertaken by amateurs. All sight records of fallow deer, including those of animals involved in road accidents, have been accepted at face value because, during the Survey, it became apparent that this species was widespread in Essex. A few errors in identification would be unlikely to have much effect on the results. Sight records of all other species were checked by an experienced 5