220 EDWAED CHARLESWGRTH, ESQ., F.G.S., ETC. 



Where then do we find one single point of correspondence 

 between the two ? 



Surely the authorities who claim Paramoudras as petrified 

 Neptune's Cup sponges should be able to tell us on what they 

 base the agreement between them. 



The Chairman (T. Chaplin, Esq., M.D.) having moved a vote 

 of thanks to the Author, 



Professor J. Logan Lobley, F.G.S., thought we might obtain a 

 clue to the solution of the difficulty if we remembered the 

 behaviour of certain accessory mineral substances in masses of 

 rock, the particles of such minerals having a tendency to aggregate 

 together, thus for instance, one found in the chalk, besides its flint 

 nodules, aggregations of metallic matter, iron pyrites. 



Professor Henson agreed with Professor Lobley. 



The Rev. W. B. Galloway, M.A., thought we must look for 

 some force of regular operation in the case of Paramoudras. 



Mr. J. T. Day agreed with Professor Logan Lobley, and thought 

 his view was supported by some investigations which proved that 

 the chalk lying centrally between two layers of flints contained 

 the highest percentage of silica, that in other parts being partly 

 absorbed by the layers of flints, and the inference was that some 

 organic matter, a twig or stem, had served as a nucleus in the 

 case of the Paramoudras. 



Other members having spoken, the Author replied. 



Votes of thanks were passed to the Royal College of Physicians 

 and to the Geological Society, for the specimens kindly lent to the 

 Institute for the purpose of illustrating the subject under con- 

 sideration, and the Meeting was then adjourned. 



