66 Royal Irish Academy. 



TABLES Nos. I. 

 Showing the Chemical and Physical Properties of the Atomic 



Abbreviations used in Column 7th to denote character of fracture : — F.C. Fine 

 Crystalline, C.C. Coarse Crystalline, T.C. Tabular Crystalline, F.F. Fine Fi- 

 brous, C. Conchoidal, V.C. Vitreo-Conchoidal, V. Vitreous, E. Earthy. 



The maxima of ductility, malleability, hardness, and fusibility, are = 1 . 



The numbers in Column 6th denote intensity of shade of the same colour. 



The atomic weights are those of the hydrogen scale. 



The specific gravities were determined by the method indicated in Report " On 

 Action of Air and Water on Iron," Trans. Brit. Assoc, vol. vii. p. 283. 



The ultimate cohesion was determined on prisms of 0-25 of an inch square, 

 without having been hammered or compressed after being cast. The weights 



