AND OrnKK WOKK IX IlKUTS. Ill 



the county, have not boon noticed, the above is enough to show the 

 groat importance of this ekiborate publication to Ilortfordishirc. 



1894. 



A detailed account of the two deep borings near "Ware and at 

 Choshuut was given by Mr. Jukes-Bkowne and myself, with a good 

 deal of new information, enabling us to correct and add to previous 

 accounts, and rofi>rring to the subject of the old underground rocks 

 of South-Eastorn England generally.* 



Although Mr. W. F. Hume's paper, " The Genesis of the Chalk," 

 is of a general character, it refers to those divisions which are well 

 marked in our county, f 



1895. 



In their paper "On the Occurrence of Radiolaria in Chalk," J 

 Messrs. W. Hill and A. J. Jukes-Browne note localities (near 

 Hitchin and near Tring) where calcitic replacements of radiolaria 

 occur in the nodular parts of the Mclbourn Rock, the dividing bed 

 between the Middle and Lower Chalk, and describe specimens. 



Sir J. Prestwich re-issued his " Geological Inquiry respecting 

 the Watei'-bearing Strata of the Country around London," for the 

 pui-pose of introducing some preliminary remarks, called for by 

 discoveries made since this important book was published, in 

 1851. § 



The Geological Survey published Sheet 12 of its Index Map 

 (on the scale of four miles to an inch), which includes the whole of 

 Hertfordshire, with the greater part of the London Basin and 

 nearly all the Weald. Whilst the hand- coloured edition of this 

 map costs ten shillings, the almost equally good colour -printed one 

 is only a quarter of that price, bringing a capital geologic map of 

 important districts within the means of all who need it. An issue 

 of 500 copies was soon exhausted, and the success of the experi- 

 ment with this sheet led to all the other sheets being issued in 

 like manner. 



1896. 

 Mr. A. E. Salter, in a paper entitled "Pebbly Gravel from 

 Goring Gap to the IS^orfolk Coast," classes the high-level gravels in 

 five groups, according to their composition. Of these the Bai'net 

 Gate type occurs in Herts, though the locality, Newgate Street, is 

 wrongly put into Middlesex : other localities, Barnet Gate and 



* ' Quart. Joiirn. Geol. Soc.,' vol. 1. pp. 501-513. 



t ' Pioc. Geol. Assoc.,' vol. xiii, pt. 7, pp. 211-246. 



X ' Quart. Jouru. Geol. Soc.,' vol. li, pp. 602, 605-8, pi. xxii. 



§ 8vo. Loudou. The new pages are pp. iii-ix. 



