Count de Bournon on BardigUone. 367 



and appeared to me larger and more numerous in the grey compact 

 variety, than in the reddish. I observed similar globules in one- of 

 the varieties of bardiglione, consisting of small blue laminag, from 

 Vulpino. 



When pieces of the rock of Arbonne have been boiled a certain 

 time in water, to free them from the sea-salt they contain, they be- 

 come porous, but very irregularly so ; and thus shew, that the sea- 

 salt is distributed unequally, and chiefly in small masses. 



Bardiglione Epigerie of Ha'uy, 



M. I'Abbe Haliy, in his Tableau Comparatif, gives the name of 

 epigene, agreeably to its Greek etymology, to every transition of one 

 mineral to another. 



The mention which he makes of this variety of bardiglione, from 

 which alone I am acquainted with it, is in consequence of a specimen 

 presented to him by M. Cordier, in which one part of the substance is 

 in the state of lamellar bardiglione, while the other is in that of com- 

 pact gypsum. To the gypsum of this specimen M. Haiiy gives the 

 name of bardiglione epigene^ because, in his opinion, its formation has 

 taken place from an action exerted on the lamellar bardiglione itself, 

 subsequent to its production ; which action, from what he says 

 p. 141, was effected by the introduction of water into its interior: 

 'whence^ he adds, the substance of the bardiglione has lost part of its 

 hardness^ and its texture has become looser. He further states, that 

 according to an observation communicated to him by M. Hassenfratz, 

 there are at Pesai, whence this specimen came, galleries carried 

 through the bardiglione, the outward part of which, being penetrated 

 by moisture, has experienced a considerable enlargement. 



