Chemistry and Physics. 129 
not stand alone, but exist in mutual relation to each other—as it is for 
their common interest that there should exist among them a system of 
not merely symbolic of the mode in which atoms are grouped, but are - 
intended also to express numerical relations, indicative of the aggregate 
nd t n each 
ommodated itself at the same time perfectly well to numerical computa- 
tion, no symbol being in any case juxtaposed, or in any way intercombined 
With one another, so as to violate the strict algebraic meaning of the 
gre: t 
Cooke of Harvard University, in the United States, (in a memoir which 
forms part of the 5th volume of the M i¢ ’ 
Arts and Sciences,) to extend and carry out the classification of chemical 
elements into families of the kind I allude to, in a system of grouping, in 
which the first idea, or rather the first germ of the idea, may be tra 
Vou, XXVII, No. 79.—JAN., 1859. 
