triple Sulphuret , of Lead, Antimony, and Copper, &c. 51 
inverse ) of the pure carbonate of lime. Lastly, in the same 
manner, the kind of talc called chlorite, which frequently in- 
troduces itself into the axinite, almost always occasions the latter 
substance to assume one of its most simple forms. 
Those stones in which there exists no other cause of union 
between their particles than the attraction of aggregation, and 
which are known by the name of aggregate stones, furnish 
an example of the attractive force that is really exerted by 
the dissimilar molecules which enter into substances during 
their formation. In granite, for instance, the integrant parts, 
which, instead of being molecules, are become masses, are as 
dissimilar as possible. Yet, although no ingredient whatever 
contributes to unite them, (their union being -brought about 
merely by the cohesion of their surfaces,) the great degree of 
hardness this stone possesses, and the difficulty with which its 
parts are separated, when it is in a perfect state, that is to say, 
when its texture has not been injured by any accidental cause, 
are both well known. This remark may be applied to various 
kinds of sandstone, of schistus, See. 
The different kinds of attraction here described, may, I confess, 
be nothing more than mere modifications of one and the same 
power, originally belonging to matter ; but this appears to me 
not yet sufficiently demonstrated. Supposing it, however, to be 
the case, they certainly exert as much force upon mineral sub- 
stances, at the time of their formation, as could be exerted by 
attractive forces of a really different nature. 
