Clifton College Scientific Society. 33 



sort of pottery made. An Act of Parliament was passed com- 

 pelling Burslem potters to make their butter-pots of a size to hold 

 1^ lbs., and sufficiently hard not to imbibe moisture ; hence the 

 above appellation of Butter Pottenj! 



Afterwards the Society proceeded to elect Directors for the 

 Entomological and Botanical Sections. For the Entomological 

 Section, W. Claxton, proposed by Don, seconded by Gibbons, was 

 elected. For the Botanical Section, D. Pearce, proposed by 

 Allen, seconded by Tebbs, was elected. 



MEETING, June 27, 1872. 

 The Peesident in the Chair. 



The seventh meeting for the term was held on Thursday, June 

 27, in the Physical Lecture-room. Nineteen members were present. 



Donations acknowledged : — A Slab found in the Bone Bed, con- 

 taining eight fish-teeth, presented by the President ; Small Crystals 

 of Selenite from the Oxford Clay, by C. Blanshard, (o.c.) ; Frag- 

 ment of an Ammonite showing the Sutures ; Fossil Wood and 

 specimens of Rhynchonella variabilis from Horfield, by the 

 President ; a Piece of Rock cut by the Diamond Drilling- Machine 

 from the Tunnel on the Durdham Downs, by J. Routh. 



C. C. Stevenson then continued his paper on * Potteries ' 

 (Part II.) 



I will now proceed to a more modern mode. The present art 

 of manufacturing pottery and porcelain divides itself into four 

 different and distinct branches, the first of which comprehends a 

 knowledge of the nature and peculiar properties of the various 

 materials whereof the vessels are composed ; the second comprises 

 the methods used in combining these materials, and in fashioning 

 the vessels ; the third branch includes the choice and management 

 of the colours and enamels emjiloyedin painting and ornamenting 

 the wares, together with the operations necessary for their conver- 

 sion ; and the last division embraces the means required for com- 

 pleting the manufacture by the assistance of fire. The chief in- 

 gredients employed in making all kinds of pottery are clay and 

 flint ; these are both classed by chemists among the primitive 

 earths. The first of them' in its state of purity is denominated 

 alumina or oxide of aluminium, and the latter is called silica or 



C 



