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XI. 
LIST OF WORKS ON THE GEOLOGY OF HERTFORDSHIRE, 
1884-1900. 
By John Hopkinson, E.L.S., E.G.S., Assoc.Inst. C.E., etc. 
Read at Watford , 23 rd April, 1901. 
Owing entirely to the initiative and chiefly to the labours of 
onr past President, Mr. W. Whitaker, E.B.S., most of the counties 
of England have their Geological Bibliography, and amongst the 
valuable series of Bibliographies compiled by him is a “List of 
Works on the Geology of Hertfordshire” from 1756 to 1873, which 
he contributed to our Society in 1875.* In 1885 I gave a further 
list of works published during the ten years 1874 to 1883, with 
some additions to the former list (1598-1873).f The subject was 
again taken up by Mr. Whitaker in his Presidential Address to the 
Society in the year 1899, but instead of a formal list of works 
commencing with the year 1884, we have in this Address notices 
of the geological and other work done for the county outside our 
own Society from 1890 to the commencement of 1899.J There 
is thus a hiatus of six years (1884-89), which in this Address 
Mr. Whitaker suggested should be filled up by me, but I consider 
it better to continue the list in the same form as before, including 
in it the publications of our Society, and completing it so far as 
I am able to do so to the end of the century. 
Eor five of the six years left untouched by Mr. Whitaker so 
far as Hertfordshire geology is concerned, 'there is no geological 
bibliography for Britain except the annual “List of Additions to 
the Library” of the Geological Society, the ‘Geological Becord’ 
having ceased with the year 1884, and the ‘ Annals of British 
Geology,’ now also defunct, having commenced with the year 1890. 
It is therefore probable that some books or papers containing 
information on the geology of Hertfordshire, published during this 
period, may have escaped my notice. 
In addition to the works here enumerated a few papers have 
been published which, although not actually treating of Hertford¬ 
shire, are of interest to the students of its geology. Of these two 
on the Chalk and two on the Eocenes may be mentioned. In 1884 
a paper by the late Professor Morris on “The Chalk : its Distri¬ 
bution and Subdivisions” appeared in the ‘Geological Magazine,’ 
which should be read by all Hertfordshire geologists, although the 
county is never mentioned in it; and in 1894 Dr. W. E. Hume 
contributed to the Geologists’ Association a paper “ On the Genesis 
of the Chalk ” of much interest to us, although the only reference 
to Hertfordshire geology is the remark that “The Greensand dies 
* ‘Trans. Watford Nat. Hist. Soc.,’ Yol. I, pp. 78-82. 
t ‘Trans. Herts Nat. Hist. Soc.,’ Yol. Ill, pp. 165-172. 
+ Ibid., Yol. X, pp. 105-118. 
