New Series.] 
[Part I. 
PAPEES 
KEAD BEFORE THE 
GEOLOGICAL AND POLYTECHNIC SOCIETY 
1871-72. 
on further discoveries of flij^t tools in hertford- 
shire and sussex. by john ffooks. 
[publication deferred.] 
ON CONTORTION OF ROCKS. BY L. C. MIALL, CURATOR OF THE 
LEEDS PHILOSOPHICAL AND LITERARY SOCIETY. 
In a previous communication to this Society I endeavoured 
to describe the remarkable anticlinals of Skipton and 
Draughton, which are perhaps the most striking features of 
the geology of South Craven. The geological relations of 
these disturbed tracts were discussed on that occasion, and I 
do not propose to refer to them now. But the most interest- 
ing problem connected with these contorted rocks is the 
circumstance that they are bent so sharply without fracture. 
On this subject I formerly offered a few remarks, and cited 
some incomplete experiments. During the last three years 
these experiments have been continued, and the most 
important results are here presented. 
The photographs now exhibited shew the contorted lime- 
stone beds in Draughton quarry. You will see that solid 
J 
