90 
J. HOPKIXSOH—LIST OF WORKS 
rocks at Ware, 828 feet below the surface of the ground, were 
found to dip at an angle of 41° about one degree west of true south, 
and that the Devonian rocks at Turnford near Cheshunt, 994 feet 
below the surface, were found to dip at an angle of 25° about 
17 degrees west of true south. If this is a true indication of the 
general dip of the Palseozoic rocks in this area, we need not fear that 
our beautiful county will ever be turned into a coal-mining district, 
for the Coal Measures, if present at all under the London Basin, 
should lie considerably to the south of Hertfordshire. In 1879, in 
treating of the Ware boring in relation to water-bearing strata, 
I expressed the opinion that ‘ ‘ it would be useless to search for 
coal (in the London Basin) north of London.” * The direction of 
dip of the Wenlock rocks in this boring had not then been 
determined, nor had the presence of Devonian rocks at Turnford 
been made known. Professor Sollas has recently (No. 309) ad¬ 
vocated the making of a trial-boring for coal “ somewhat west of 
Enfield Lock,” but the arguments which he adduces in support 
of his views do not seem to me to warrant such an experiment. 
Deferences to accounts of earthquakes are not included in this 
list, except in one instance (Ho. 157) where there is information 
on the strata which transmitted the shock. Some material has 
been collected towards a catalogue of Hertfordshire earthquakes, 
in which such references would more appropriately be given. 
1884. 
137. Bohney, Prof. T. G. On the Microscopic Structure of 
a Boulder from the Cambridge Greensand, found at Ashwell, Herts. 
Proc. Cambridge Philos. Soc ., vol. v, pt. 1, pp. 65-67. 
138. Elsdeh, J. Y. On the Microscopic Structure of Boulders 
found in the North of Hertfordshire. Trans. Herts Nat. Hist. Soc., 
vol. iii, pt. 2, pp. 47-57, pis. iii-v. 
139. Eordham, H. G. Notes on Boulders and Boulder Clay in 
North Hertfordshire. Trans. Herts Nat. Hist. Soc., vol. iii, pt. 1, 
pp. 33-46, pis. i, ii. 
140. Eordham, H. G. Thirteenth Deport of the .... Erratic 
Blocks Committee. By Dr. H. W. Crosskey. Pep. Brit. Assoc. 
for 1883, pp. 136-146. (Herts, by H. G. E., pp. 143-146.) 
141. Eordham, H. G. On a Boulder from the Chloritic Marl of 
Ashwell, Herts. Ib. t Trans. Sections, pp. 505-506. 
142. Erench, H. H. A Paper on Bournes. 8vo. Sutton, Surrey. 
(Geological Map and Section of the London Basin, including Herts.). 
143. [Hopkinson, J.] Field Meeting .... Berkhamsted and 
the Yalley of the Bourne. Trans. Herts Nat. Hist. Soc., vol. ii, 
pt. 8, pp. lv-lx, (Demarks by Dr. J. Evans, pp. lvii-lix.) 
144. Hopkihsoh, J. Excursion to Dadlett. Proc. Geol. Assoc., 
vol. viii, no. 8, pp. 452-458. Eield Meeting .... Dadlett and 
Battler’s Green. Trans. Herts Nat. Hist. Soc., vol. iii, pt. 4 (1885), 
pp. xli-xlvi. 
* ‘ Trans. Watford Nat. Hist. Soc.,’ Yol. II, p. 246. 
