I i On Numerical Propprltom 



ever find myself at issue with the practical CollierR, Miners, &;c. 

 but on matters of inference, or involving their belief, of things 

 vol actually seen by themselves, I almost dailv, when on mv 

 Mineral Surveys, find myself point blank at issue with them, and 

 so have been obliged to continue, in numerous instances; — I am, 



1 hope, alike incapable of being influenced bj' n?/viters, to adopt or 

 reject any position or deduction to be madeTrom the study of Geo- 

 logical pha'nomena, as I am of yielding in any such cases to au- 

 thority, however academical or imposing its aspect may be ; norwill 

 I stand quietly by and see, a most deserving Individualand Friend, 

 deprived of the just reputation due to his labours and discoveries, 

 or neglect the attempt, at contributing towards his more solid 

 reward. And I am. 



Sir, 



Your obedient servant, 

 1':, Upper Crown Street, JoHN FaREY, Sen. 



Westminster, May S, 1815. 



LXII. Letter from M. Ampere to Covnl Berthollkt, 071 the 

 Determination of the Proportions in which Bodies are covi-; 

 lined, according to the respective Number and. Arrangement 

 of the Molecules ofiuhich their integrant Particles are com-r 

 posed. 



[Concluded from p. 193.J 



W E may also deduce from this manner of conceiving the com- 

 position of bodies, the relations of the quantities of acid, basis, 

 and even of water of crystallization, which ought to be found in 

 the acid salts, the neutral, or those that are hvpcrsaturated with 

 one and the same sjiecies, according to the representative forms 

 of the particles of the acid and the base. It is thus, for instance, 

 that we find, according to tliat of the particles of the sidphuric 

 acid, that most of the supersaturated sulphates ouglit, conform- 

 ably to experience, to contain three times more bases than the 

 neutral sulphates, and that the quantity of julphuric acid is 

 double in the acid sulphates to what it is in the neutral sulphate; 

 whereas the sulphurous acid may, according to the representative 

 form of its particles, make with ammonia an acid salt, into which 

 it enters in greater quantity than into the neutral sulphite, in 

 the ratio of three to two only. Such, in short, is the acid sul- 

 phite which we obtain by distilling the neutral sulphate of am- 

 monia. 



I shall not enter here into the details contained in my full 

 memoir on the different combinations of ammoniacal gas with 

 the other acid gases: the accordance of the results to which we 



are 



