110 ^\. WHiTAKER — address: geological 



W. B. Bryan (17, 103, 199, 467); Prof. W. B. Dawkins (33); 

 W. ToPLEY (37, 313) ; Major L. Flower (39, 43, 216) ; J. Child 

 (48, 218) ; W. C. Young (49) ; Dr. G. Turner (169, 250) ; 

 W. J. DiBDiN (191) ; Dr. T. Stevenson (246) ; C. E. Longmore 

 (248) ; U. A. Smith (252, 308) ; T. Hawksley (257) ; B. Latham 

 (276) ; J. HoPKiNSON (304) ; Myself (349) ; Sir J. Evans (367) ; 

 C. DocwRA (375). 



Turning to tlie volume of "Appendices" we have first the 

 statements supplied hy the New River and East London Companies, 

 describing their supplies. Then the statements of the Lea 

 Conservancy (114) and of W. C. Young (126), with many analyses 

 of waters. J. G. Symons treats of the Rainfall over the Watershed 

 of the Lea (175). Dr. A. Ashby notes the pollutions along the 

 Colne and its tributaries (183). Dr. G. Turner reports similarly 

 on the Lea and its tributaries (197). Dr. E. Frankland gives 

 a number of analyses of Lea water (201). W. J. Dibdin gives 

 analyses of New River water from the intake near Hertford (244), 

 of waters of the Lea and of its tributaries (266, 294, 322), and of 

 various sewages (272, 330). C. E. Longmore, Dr. T. Stevenson, 

 Dr. G. Turner, and U. A. Smith treat of the Hertford sewage and 

 of its effluent (336, 337, 342, 345) ; but I must beg leave to differ 

 with them as to the latter liquid, of the nastiness of which 

 I have had personal experience : it is a disgrace to the county. 

 J. HoPKiNSON gives a long account of ' ' Hertfordshire Rainfall, 

 Percolation, and Evaporation" (374),* and is followed by U. A. 

 Smith with a statement on behalf of the Herts County Council, 

 dealing with abstraction of water from the Chalk, condition of rivers 

 and springs, cause of decreased flow, flow of the Lea, yield of 

 Chadwell Spring, particulars of various rivers, springs, and wells 

 (389). W. Topley gives measurements of the areas of the various 

 geologic formations (folding table, opp. p. 414), a most valuable piece 

 of work, arranged by river-basins. Prof. W. B. Dawkins treats of 

 supplemental supplies from wells, with several references to Herts 

 (419). My "Memorandum on Swallow-holes" also refers to the 

 county (431), and Sir J. Evans discusses percolation, etc. (441). 

 A Report, by R. E. Middleton, "on an Inquiry into the Alleged 

 Depletion of Rivers, Springs, and Wells in Hertfordshire," ranges 

 from p. 540 to p. 675, and may be briefly described as in contra- 

 vention of the statements by Mr. U. A. Smith and others on behalf 

 of the county, the author thinking "that there is no proof of any 

 permanent depletion of any river, well, or spring, except fi'om 

 local causes." Although several matters, more or less concerning 



* Reprinted iu 'Trans. Herts Nat. Hist. Soc.,' vol. ix, pp. 33-72. 



