4 THE MAMMALS, REPTILES, AND FISHES OF ESSEX. to Windsor, but stags lingered in the Forest at least as late as 1827 (See Proc, E. F. C, vol. i., xlvii.) A few Red Deer have since been re-transferred to the Forest, in the hope of restoring the original stock, but they proved so destructive to the crops of neigh- bouring farmers that they had to be destroyed. The Roe Deer, which appears to have been by no means rare in late mediaeval times, became extinct for many years ; but this species also has been re-introduced, from Dorsetshire, and is doing well. We hope that, by the restoration of the Red Deer, we may soon be able to say that all the species of British Deer exist in a wild condition in Essex. Under the head of terrestrial Mammals, it may be pointed out that Essex, as compared with many counties, shows a high record of Bats, eight out of the sixteen species given by Bell having been actually found in the county, without including the two others named by Bell and Newman, which, as will be afterwards explained (see pp. 31 and 123), must not be placed to the credit of Essex. This abundance of Chiroptera may be in part owing to more careful observation of that par- ticular Order, but it is also owing to the fact that our county is within the northern limits of several species. Mr. Christy's records of the capture of two specimens of the Serotine seem a proof that still further attention would result in more finds, for it is difficult