7^ Proceedings of Philosophical Societies* [Jan, 



vnth regard to the tetrahedron. If we conceive the octahedron 

 to be the primitive form of such crystals, it is obvious that a 

 coDgeries of octahedral particles, v^ben connected together, vi'ill 

 leave betv^^een tbera tetrahedral cavities, if the tetrahedron be 

 chosen as the primitive form, we must then suppose tbe crystal 

 full of octahedral cavities. Hence a difficulty arises. Haliy has 

 made choice of the tetrahedron as the primitive form. Dr. 

 WoUaston, with his usual ingenuity, has shown^ that if we 

 suppose the atoms of such crystals to be spheres, such bodies 

 could arrange themselves into tetrahedrons or octahedrons, with- 

 out the necessity of supposing such vacuities. Dr. Wollaston 

 applied this ingenious idea, which he mentioned as originally 

 suggested by Dr, Hooke, to the constitution of bodies in gene- 

 ral, and showed how all crystalline figures could be composed of 

 particles having the shape of spheres^ or sometimes of flat 

 spheroids. 



On Nov. 3O5 or St. Andrew's Da}^, the Society met^ as usualj 

 to elect their office-bearers for the ensuing year : when th^ 

 following Noblemen and Gentlemen were elected : — • 



President, Right Hon. Sir Joseph Banks, Bart. 

 Secretaries, Dr. William Hyde Wollaston. 



Taylor Combe, Esq. 

 Treasurer, Samuel Lysons, Esq. 

 Foreign Secretary, Dr. Thomas Young. 



OF THE OLD COUNCIL. 



Right Hon. Sir Joseph Banks, Bart. K.B. Pfes= 

 Sir Charles Blagden. 



Samuel Goodenough, Lord Bishop of Carlislco 



Anthony Carlisle, Esq. 



Sir Humphry Davy. 



Samuel Lysons, Esq. Treasurer. 



Joseph de Mendoza Rios. Esq. 



Cjeorge Earl of Morton. 



John Pond, Esq. Astronomer Royal. 



jDr. William Hyde Wollaston, Sec. " 



Dr. Thomas Young, Foreign Sec. 



OF THE NEW COUNCILo 



George Earl of Aberdeen. 

 Taylor Combe, Esq, Sec. 

 Sir Thomas Frankland, Bart. 

 Sylvester Lord C41enbervie. 

 Philip Earl of Hardwicke. 

 Matthew Raper, Esq. 

 Samuel Rogers, Esq. 

 Smithson Tennant, Esq. 

 Rev. William Tooke. 

 . Roger Wiibraham, Esq. 



