NEW VARIETIES OF CARBONATE OF LIME. ] gQ 



small bits of gold wire, and having interposed them in that iaterrupui 

 state, between the extremities/? and n, fig. 1, of the two *^""'^^"* 

 wires connected with the positive and negative sides of the 

 battery, I observed, with pleasure, a considerable disen- 

 gagement of gas taking place, at the same time, from each 

 extremity of all the unconnected wires, which formed the 

 galvanic circuit. 



Having thus pointed out the circumstances which misled The principle 

 Ritter and his followers, and established, beyond all doubt, of the deci>m- 

 the important fact of a positive and a negative point at every fore the same* 

 interruption of the circuit, it is almost unnecessary to ob- in all cases, 

 serve, that the decompositions, which happen by employing 

 the arrangement first suggested by that philosopher, admit 

 of being explained on the same principles as the decompo- 

 sition effected by introducing under the same receiver a * 

 positive and a negative point, proceeding immediately from 

 the galvanic battery. 



I am, Sir, your most obedient servant, 



ADAM ANDERSON. 



Perth Academy^ 

 Sept. 23, 1311. 



VI. 



Description of several new Varieties of carbonated Lime : by 

 Mr. Hauy*. 



JL HOSE problems, of which the object is to determine Two Jaws of 



the varieties of a crystallization having a rhomboid for its '*^?^^'"^"* 'j'' 



primitive form, are susceptible of two solutions, which lead nucleus, dster- 



to the same figure by different laws of decrement. Me- """^^'^ ^1 



, , . cleavage. 



chanical division, by making known the position of the faces 



of the nucleus with respect to those of the secondary crys- 

 tal, shows on which of these two laws the figure of a given 

 crystal depends. In the course of a long time I had very Sometimes na- 

 seldom met with the two solutions at once in the same sys- ^^'« follow? 

 tem of crystal lizati on ; but instances of this kind have been ^ ' 

 m«re numerous among the recent observations I have made 



* Journal des Mines, vol. XXIII, p. 49. 



