LIST OF WORKS ON THE GEOLOGY, ETC., OF ESSEX. 75 (151) Reid, H. A Practical Treatise on the Manufacture of Portland Cement. [Analyses of Cement Stones from Southend and Harwich, p. 15]. 8vo, London. (152) Whitaker, W. Geological Map of Terling (Essex), to accompany Dr. Thorne's Report on Typhoid Fever. Scale a foot to a mile. Report of the Medical Officer of the Privy Council for 1868. 8vo, London. (153) Wood, S. V., Jun. On the Pebble-beds of Middlesex, Essex, and Herts. Quart. Journ. Geol. Soc, vol. xxiv, pp. 464—472. (154) Wood, S. V., Jun. Reply to Mr. Dawkins, on the Thames Valley Deposits, etc. Geol. Mag., vol. v, p. 42. (155) Wood, S. V., Jun. The Ouse Valley, the Thames Valley, &c. Geol. Mag., vol. v, p. 147. (156) Woodward, Dr. H. On the Curvature of the Tusks in the Mammoth [Ilford]. Geol. Mag., vol. v, p. 540. 1869. (157) Dawkins, Prof. W. B. On the Distribution of the British Post-Glacial Mammals. Quart. Journ. Geol. Soc., vol. xxv, p. 192. (158) Lucas, J. The Boulder Clay and the Thames Valley. Geol. Mag., vol. vi, p. 188. (159) Olliver, R. E. Fossils at Walthamstow. Science Gossip, no. 59, p. 258. (160) Owen [Sir] R. Note on the occurrence of Remains of the Elk (Alces palmatus) in British Post-tertiary Deposits [at Walthamstow]. Geol. Mag., vol. vi, p. 389. (161) Tylor, A. On Quaternary Gravels. Quart. Journ. Geol Soc, vol. xxv, p. 57. [Essex pp. 83—86, 89, 96—100.] (162) Woodward, Dr. H. The Freshwater Deposits of the Valley of the Lea near Walthamstow, Essex. Geol. Mag., vol. vi, p. 385. 1870. (163) Jordan, J. B. Stanford's Geological Map of London, showing Superficial Deposits. (Scale an inch to a mile.) London. (164) Penning, W. H. Geological Note, Map, &c., in Dr. G. Buchanan's Report of an Epidemic of Typhoid Fever at Wicken Bonant. Report of the Medical Officer of the Privy Council for 1869, p. 72. 8vo, London.