lxxXVl PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [vol. lxxiV, 



April 17th, 1918. 



Mr. G. W. Lamplugh, F.R.S., President, 

 in the Chair. 



The List of Donations to the Library was read. 



The following communication was read : — 



'The Evolution of the Liparoceratidae.' By Arthur Elijah 

 Trueman, M.Sc, F.G.S. 



Lantern-slides and specimens of Ammonites were exhibited by 

 Mr. A E. Trueman, in illustration of his paper. 



May 1st. 1918. 



Mr. G. W. Lamplugh, F.R.S., President, 

 in the Chair. 



Capt. Rupert William Palmer, M.C., M.Sc, 10 Mayheld Road, 

 Kersal, Manchester ; and Arthur James Pickering, Abbeycraig. 

 Hinckley (Leicestershire), were elected Fellows of the Society. 



The List of Donations to the Libraiy was read. 



Dr. Arthur Hubert Cox delivered a Lecture on the Rela- 

 tionship between Geological Structure and Magnetic 

 Disturbance, witli especial reference to Leicestershire and the 

 Concealed Coalfield of Nottinghamshire. 



Before the Lecture, at the request of the President, Dr. A. 

 Strahan, F.R.S., Director of the Geological Surve}^, briefly out- 

 lined the circumstances that had led to an investigation into a 

 possible connexion between geological structure and magnetic dis- 

 turbances. The magnetic surveys conducted by Riicker and Thorpe 

 in 1886 and 1891 had proved the existence of certain lines and centres 

 of disturbance, but those authors observed that ' the magnetic 

 indications appear to be cmite independent of the disposition of the 

 newer strata,' and he (the speaker) had not been able to detect any 

 obvious connexion with the form and structure of the Paheozoic 

 rocks below. In 1914-15 a new magnetic survey was made by 

 Mr. G. W. Walker, who confirmed the existence of certain areas of 

 disturbance. It was suggested that the effects might be due to 

 concealed masses of iron -ore, and the matter was referred to the 

 Conjoint Board of Scientific Societies, who appointed an Iron-Ores 

 Committee to consider what further steps should be taken. The 

 Committee recommended that attention should be concentrated 



