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attrads the particles difTolved, by its different furfaces ; but if a 

 fait of a different nature be inferted this will not happen, cryflali- 

 zation will not be promoted. 



10. If to a folution of 2 parts nitre, and 3 parts Glauber's 

 fait in 5 parts water, a cryftal of nitre be inferted, the nitre alone 

 will cryftalize ; or if inflead of nitre a cryflal of Glauber be in- 

 ferted into it, the Glauber alone will cryftalize. Do not thefe 

 experiments fully evince both the attractive and repulfive powers, 

 not only' of different falls but of different furfaces of the fame 

 fait ? 



11. These powers within their proper fphere of adion have been 

 found indefinitely great ; thus water confined in cannon feveral 

 inches thick, and expofed to a degree of cold much beneath the 

 freezing point, has been obferved to cryftalize into ice that burft 

 the metallic impediment oppofed to the form it then affumes. 



12. The vaft difference however attending the developement of 

 thefe two powers (of magnetifm and cryftalization) will undoubt- 

 edlv ftrike many as an infuperable objedion to their identity, 

 yet their direEiion in all its varieties being exadly the fame, 

 difference in other circumftances feems to me to indicate rather a 

 variety of degrees^ in the fame power, than any effential difterence 

 in the powers themfelves. 



I NOW 



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