vi. Text fig. The Flint Industry of Clacton, facing p. 23. Plate II. Joseph Lister as a boy, facing p. 98. Plate III. Joseph (afterwards Lord) Lister, at age 29, facing p. 100, Plate IV. Joseph, Lord Lister, at age 79, facing p. 102. Text fig. Vegetational Regions in Essex, p. 118. Text fig. Prehistoric Settlement Sites in Essex, p. 119. Text fig. Probable Vestiges of Roman Centuriation in Essex, p. 122. Text fig. The Forest of Essex in Saxon Times, p. 125. Text fig. The Forest Area in 1086 A.D p. 128. Text fig. Extent of the Forest in the Medieval Period, p. 131. Plate V. Upton House : the room in which Lord Lister was born, 5th April, 1827, facing p. 136. Plate VI. Bridge over the Channel- sea River, Stratford, facing p. 144. Plate VII. The Lea Valley Reser- voirs from the Air, facing p. 179. Plate VIII. Great Crested Grebes and Nest, facing p. 200. Plate IX. Dytiscus marginalis, facing p. 215. Plate X. Hydrous piceus, facing p. 217. Plate XI. John Avery, facing p. 242. Plate XII. Title-page of Introduc- tion to the Knowledge of Funguses, 1820, facing p. 268.