PREFACE. It gives me much pleasure to acknowledge my great obligations to Dr. Wharton, the Rev. Dr. Walker, and Mr. J. E. Harting for very kindly furnishing me with their Lists of Hampstead Species, which derive a value both from not having been previously published and from the scientific position and long experience of their Authors. CITY OF LONDON COLLEGE, August, I 889. J. L. L. HA.M PSTEAD I4 ILL. CHAPTER I. THE ENVIRONS OF LONDON. WHEN an English summer brings glorious English summer weather, which in some years, however, is slow in coming, the thoughts of Londoners instinctively turn to almost every place except their own wonderful town-to the sea-side, to .the cc Lakes, to Scotland, to Wales, to Killarney or the splendid coast of Wicklow, to the Rhine, to Switzerland-but still a few who are not altogether Philistines have visions not so far afield...